Checking for Lumps

by Pan

Chapter 1

"It's important," my brother said, standing in my doorway.

I sighed and looked up from the computer screen. My brother was always coming into my room. He was ten years older than me and left home for college when I was only eight, so we’d never spent much time together—just family holidays and stuff like that.

Now, ten years later, he was a fully-qualified doctor. And a total know-it-all about it.

"I know," I sighed. "But I'm only eighteen. It's not like these" —I gestured to my boobs—"are about to explode tomorrow."

He shook his head. "You never know."

I rolled my eyes. When Alex got a bee in his bonnet, it was impossible to talk him down. "Fine," I said, turning my attention away from him. "I'll check in the shower tomorrow."

I thought that would be it; he'd gotten what he wanted. He'd won. But when I looked up a few moments later, he was still there, standing in my doorway.

"Now," he said, and I raised one eyebrow. He couldn't be serious.

But as I looked at him, I realized he was. "Alex…" I began, but he held up one hand.

"Tammy," he replied sternly. "I'm a doctor."

My eyes widened. Fuck. I mean, I'd known he was a doctor, but… I dunno, the way he said it. I suddenly knew that I had to do what he said.

I had to do what he said.

Without another word of complaint, I stood from my chair and awkwardly moved my hands up to my shirt-covered breasts.

"Do you mind… turning around?" I asked nervously, but my brother shook his head.

"I should watch," he said firmly. "Make sure you're doing it right."

Something about that didn't sit right, but… well, who was I to argue?

He was a doctor.

So, while my brother watched, a strange expression on his face, I checked my breasts for lumps. First, my left tit, then my right. After several minutes of poking and prodding, I turned to my brother expectantly.

I don't know what reaction I expected— a ’well done, you nailed it’, I suppose—but I was met with a small shake of his head.

"W-what?" I asked, suddenly embarrassed.

"Well, first of all, are you wearing a bra?"

I nodded.

"So you're checking through two layers. After just telling me you were going to check tomorrow in the shower. Nude, I assume."

"I, uh…"

He continued to stare at me, and I fell silent.

Yeah. I didn't really have an excuse. I just hadn't wanted to… y'know, strip off in front of my brother. Because he was my brother.

But, more importantly, he was a doctor. So I dismissed my dumb hang-ups and slowly removed my T-shirt, tossing it onto my bed.

Standing in front of my brother wearing nothing but a bra felt slightly awkward, but I tried to remember that he was a medical professional—and related to me—and that this was as normal as stripping off in front of a girlfriend or my Mom. With that in mind, I unhooked my bra and shrugged it off, letting it fall to the floor.

Alex's attention turned straight to my bare tits. It was nothing but medical curiosity, I reminded myself—he wasn’t looking at them as a man but as a man of medicine. And so I straightened my back, pushing my tits out slightly as I did.

They've gotten more than their fair share of attention over the past few years; as soon as I hit puberty, they started growing like crazy, and by the time I was seventeen, they were large enough to need special support. So I bought a couple of bras specifically designed to keep my big boobs from bouncing, and I wore them pretty religiously. This wasn't the first time I'd been topless in front of a man, but it was definitely the first time I'd shown them to someone who I wasn't… interested in.

But this wasn’t foreplay. It was a medical thing.

As I stood there, Alex didn't stop staring. If he hadn't been my brother—and a doctor—I would've mistaken the look in his eyes as lust, like he was checking me out. He kept moving his gaze from my face all the way down to my chest, and back up again. It was incredibly uncomfortable, but I didn't say anything. I'd already embarrassed myself in front of him once, and I didn't want to repeat the experience.

As he stared, I blushed furiously: I could feel my nipples hardening, and I was acutely aware of how pink they were. How soft and round my breasts were. How much men wanted them. It was a strange thought to have about my own tits, but as Alex stared at them, I couldn't help it.

I had fantastic boobs. I didn't know anyone with bigger breasts than me outside of extreme fetish porn on the internet. Every guy who saw them stopped and stared; apparently, my brother was no exception.

No wonder he was so concerned about finding a lump. Getting a double mastectomy when you had a bosom like mine would basically be a crime against nature.

So, as my brother watched, I carefully checked for lumps. One by one, I ran my fingers over each breast, feeling for irregularities or bumps.

The whole time, he just stared.

"Nothing," I confirmed, finally.

I thought that would end it, but no.

"How can you be sure?" he asked, and I honestly wasn't sure how to answer.

"Because I… didn't find anything?"

"But how do you know?" he repeated, and I finally understood what he meant.

I always understood that you'd know if you found a lump. It would be like finding a piece of gristle in your soup, instantly recognizable as something that wasn't supposed to be there.

But I wasn't a doctor.

Fortunately, I had one standing right in front of me.

"Would you like to check?" I asked my brother, blushing furiously. God, what if he got the wrong idea?

Fortunately, Alex is a professional. If he wasn't, I could easily have mistaken the look that appeared on his face as one of lust instead of what I knew it to be: doctorly enthusiasm.

Right?

He nodded. "Yes," he replied. "But only as a special favor. Y'know, cos you're my sister."

"I appreciate it," I said, still beet-red. All of a sudden, I felt self-conscious about my own thoughts. Why would I have worried he would think my request was anything other than asking for his medical opinion?

He was my brother. And he was a doctor.

I tried to breathe normally as my brother reached forward slowly, cautiously—professionally. I felt his warm, calloused fingers brush against my skin, and I shuddered slightly.

It had been a while since I'd had a man touch my breasts. And, of course, this was the first time that person had been my brother.

I looked up at him, trying to make eye contact. His eyes were locked on mine, but his focus was entirely on my bare tits. For almost ten minutes he slowly checked them, pressing gently here, prodding there. I squirmed as he tweaked my nipples and tried to ignore his smile as they hardened in his hands.

I felt strangely comfortable having him examine me. After all, he was a doctor—a professional.

When he finished, I took a deep breath. "Anything?"

"I can't be sure," he said, shaking his head. "There's special equipment back at the office that would let me check more thoroughly… but since we're so far from there, I might have to use my mouth."

My eyebrows shot up. "Your mouth?"

It didn't make any sense. I'd never heard of such a thing. Why would he need to use his mouth on my breasts? That was so invasive—It wasn't like anything I'd seen before.

"That's the best way," he explained reassuringly. "It's the only way I can be sure."

"What are you talking about?"

"It's called 'oral palpation', Tammy," he explained. "It's used to detect hard-to-find tumors and other abnormalities in patients. Frankly, it's just as good as the equipment, if not better."

"I don't know if I'm comfortable with this…" I said, squirming slightly, and my brother looked at me sternly.

"I'm a doctor," he reminded me, and my blush returned.

Right. Duh. Why did I keep forgetting that? He wasn't going to try to take advantage of me— I was his sister, and he was a professional. A doctor.

With a sigh, I nodded. "Whatever you've got to do, doc."

My brother licked his lips as he leaned in and began exploring my chest with his tongue. He ran it up and down between my breasts, circling my nipples. Each time he did, I felt a tingle run through my body as the sensitive nerves in my breasts reacted to his touch.

I tried to remind myself that this was a simple medical procedure and that he was my brother, a doctor, but… well, apparently, bodies don’t really work that way. When someone starts licking your breasts, even if they're a doctor—even if they're your brother!—  you're going to get turned on. And so, as Alex took one nipple into his mouth and gently sucked, I felt myself getting wet.

I closed my eyes, trying to ignore what was happening. I didn't want Alex to think that I was enjoying this. I didn't want him to think that I was a pervert. Here he was doing me a favor, and I was reacting like this was… I dunno, foreplay.

Fuck. How could I tell him to stop without making him suspicious?

I didn't want to admit that I liked it. I didn't want to admit that my brother's tongue felt good on my breasts.

But at the same time, I couldn’t deny what was happening, how my body was reacting.

I opened my eyes. Alex's eyes were locked on mine, and I couldn't look away. I was trapped, unable to look anywhere except into his blue eyes. As I watched, he switched his attention from my right boob to my left, then back again. With each lick, each suck, I felt myself becoming more and more aroused.

And with every moment, I felt more and more exposed in front of my brother.

I couldn't look away. But I also couldn't bring myself to ask him to stop. This was a medical procedure, after all. My doctor needed to see exactly what was going on with my breasts. He needed to feel them and lick them… it was important to check for tumors.

It wasn't his fault that my girls were so sensitive.

Finally, after what felt like half an hour, Alex was done. My entire chest was coated with his saliva, and I knew I was breathing heavily. I wanted nothing more than for him to leave so that I could touch myself, so that I could relieve the pressure building inside me, but he just stood there, waiting for my reaction.

"Are you okay?" he asked, and I nodded, not trusting myself to speak. "You seem…"

He trailed off, and my blush got impossibly deeper. What? Aroused? Turned on by my own brother licking my boobs? That morning, I wouldn’t have thought that it was possible for Alex to turn me on. To make my pussy start dripping with need. That I’d find myself craving more of his touch, of his tongue…

I would’ve been wrong.

I felt as though I'd been caught masturbating. I was so ashamed.

"… unwell," he finished, lips pursed.

My eyes widened. Oh, thank god. He'd mistaken my arousal for sickness! I was so relieved—he had no idea how much I'd enjoyed his mouth on my tits. He'd offered me the perfect excuse.

"I think I might be," I finally stammered, and Alex sighed.

"In that case, I should give you a full checkup. Take your clothes off and lie down."

It felt like every drop of blood left my body. I was suddenly filled with terror—I was going to have to strip naked in front of my brother. As soon as I took my panties off, he'd know. He'd know how wet I was. How wet he'd made me.

But Alex didn't seem to notice my hesitation. His eyes flicked down to my chest and then back up to my face. "I didn't find anything," he added. "But it never hurts to be sure."

"I t-think I'm okay," I managed, finally. "I'm fine. Don't worry about it"

Alex shook his head. "We should have you checked out just to be safe. Just take your clothes off and lay down on your bed."

Still, I hesitated. And so my brother looked me in the eyes and said three simple words:

"I'm a doctor."

Chapter 2

I didn't even remember stripping. But all of a sudden, I was naked, laying on my bed, the smell of my soaking wet pussy filling the room as my brother 'inspected' me.

He took his time, looking over every inch of my naked body. I kept my pubic hair trimmed short, which seemed to catch his attention. It felt like he spent longer studying my pussy than the rest of me put together.

As I watched, I saw his nostrils flare slightly. He was sniffing, smelling me. Smelling my arousal. But had he put it together? Had he realized what had turned me on so much?

"You're unusually wet," he said, wrinkling his nose, and I could do nothing but nod. "That could be a sign of an impending illness. Do you mind if I…"

Before I could say anything, his hand was on my leg, rubbing softly up and down between my thighs. I gasped, surprised. I'd imagined he'd start the examination elsewhere, but my brother's hands were already exploring my pussy.

His fingers slipped inside of me, sliding in and out of my wetness. I bit my lip as he touched me, watching him closely. There was no trace of lust or lechery in his blue eyes. He just seemed concerned, curious.

He was a doctor, after all.

"How does that feel?" he asked, his voice low.

I didn't know what to say, so I just bit my lip as he continued to stroke me. His fingers moved in and out at a rapid pace, exploring my tunnel and making sure that I was healthy. But his touch felt so good, and I felt myself getting closer and closer to cumming.

This wasn't right. Right? I'd had many doctor's appointments in my life, but none of them had… brought me to orgasm.

This was wrong. My brother shouldn't be touching me. He definitely shouldn't have his fingers between my legs, sliding them in and out like a cock. I needed to sit up. I needed to say something. I needed to resist!

"Don't worry," he said before I could get the words out. “This is all perfectly normal. I’m a doctor."

I lay back, relieved. Of course. What had I been thinking? He was a medical professional; what was I thinking, telling him how to do his job?

I couldn’t say no.

"Just relax," he said. "Let me take care of you."

He spread my legs apart with his other hand, continuing to slowly saw in and out of my pussy. Slowly, I relaxed. I felt his fingers slide deeper into me, slipping past my tight walls and pressing against my G-spot. I moaned as he touched me, and he smiled.

"Does that feel good?" he whispered.

"Mmmhmm," I mumbled, too embarrassed to say anything else. The sensations he was causing inside of me were intense.

He slid a third finger inside of me, and I groaned loudly. "How about that? I'm just checking your, uh, capacity."

"Oh fuck," I gasped. "Yes… yes… right there!"

"Good girl," he murmured, and I whimpered with pleasure at his words. "I mean… good patient. You're such a good patient."

His other hand returned to my tits and resumed inspecting them, checking for lumps. He tweaked and pulled at my nipples as he examined my chest and pussy, and I groaned, leaning back and closing my eyes. He was driving me insane.

I could barely think straight. All I could do was moan, plead, and whimper as my brother pushed his fingers deeper, stretching me open and exploring every inch of my insides with his probing digits.

I didn't want to cum. I couldn't believe this was happening, that my brother—my doctor!— was fingering me like this. But at the same time, I knew I had to trust him.

I had to.

He was a doctor.

"Right there," I gasped, and my brother smiled. He stroked me faster, and I cried out as I came, my body shaking as I spasmed around his fingers. But even when I was done, he didn't slow down, and soon, I felt a second orgasm building.

"Oh, fuck!"

I'd never been multiorgasmic. Perhaps that's what Alex was checking for? That didn't sound right, but as I felt another wave of pleasure crashing over me, I couldn't think. Didn't want to think.

Just wanted to cum…

His thumb rubbed against my clit for the first time, and I shuddered. I threw my head back and screamed, clutching onto my sheets as wave after wave of bliss washed over me. I couldn't stop myself from moaning, from screaming, even as my orgasm faded and my breathing slowed.

And then I heard my brother murmur, "Interesting."

I looked up at him, and his smile grew wider still. I’m getting closer to working out what’s wrong with you.

In that moment, it didn't feel like anything was wrong with me. I mean, except for the fact that I’d just been fingered to a double orgasm by my brother. But honestly, even that wasn’t worrying me. I felt like I was nothing but a puddle of bliss.

However, I didn’t want to let on how much I’d enjoyed that, so I forced my mouth into a frown. "What do you mean?"

Alex slowly pulled his digits out of my wet pussy, and I shuddered at the sensation of his fingers leaving me. "Your breasts didn't have lumps, but they are… larger than normal."

I squinted at my own breasts. Even lying down, they were still full and round. "Are they?"

"They are," he confirmed. "And do you know what that means?"

I shook my head.

"It means you're at your most fertile," he said, his hand continuing to play with my erect nipple. Something about it felt wrong— he was my brother, but I didn't want to object.

It felt too good.

"That's why you were so wet," he said. "That's why you came so easily. You're fertile."

"Okay…" I said, and Alex tilted his head to the side.

"Maybe I'm not being clear," he said, pursing his lips. "You're at your most fertile right now. If you want to have a child, you should be having sex as soon as possible."

"I wasn't…" I paused. Wait, what? "I don't… I don't want to have a child?"

Alex looked at me like I was an idiot. "You don't want to be a mother?"

"Well…"

He sounded so confident, and my head was still fuzzy from the two most powerful orgasms I'd ever experienced. Back to back!

"I mean, eventually," I finally said. "But not…—"

"Tammy," he interrupted. "I'm a fertility doctor."

Shit. How had I forgotten that? My brother's specialty was fertility—his entire practice was dedicated to helping people conceive.

"So if you came to me," he continued, "it must be because you want kids."

"I mean. Eventually, I guess, but…"

"If you came to me," he repeated firmly. "It must be because you want kids. I'm a fertility doctor."

The room was spinning. I hadn't come to him, had I? But if I hadn't come to him, why was I lying naked on my bed? Why had I let him perform such an invasive checkup?

There was only one answer.

"I… I want to conceive," I said slowly, each word more difficult than the last. "But.…"

My brother paused, letting me piece the thought together.

"I don't have a boyfriend?"

"Ah," he said thoughtfully, his eyes flicking up and down my body. "Well, now. That could be an issue. Is there anyone in your life who you trust enough to be a sperm donor?"

My mind was blank. "Um…"

"No." Alex waved off the idea. "No, that would take too long. We need someone who's right here, right now. That's your best bet of conceiving."

"Right here?" I asked, my voice cracking. "N-now?"

A huge grin spread across my brother's face. "Of course!" he said. "I've got it."

I didn't say anything. Something told me I already knew the answer.

"I can help!"

"But… I'm your sister."

"It's okay," he smiled. "No charge."

"But shouldn't… but can't we…"

"Relax," Alex said soothingly. "I'm a doctor."

I nodded slowly, feeling weird. Weird and excited.

He reached out a hand and gently stroked my cheek. "Come on," he said, pulling his pants down. "Let's take advantage of your fertile state."

I watched as my brother stood up, moving his clothes to the floor. I hadn't seen him naked before, so I wasn't sure what to expect.

I mean, why would I have seen him naked? He was my brother, ten years older than me.

He had broad shoulders and a narrow waist, and his dick was thick and impressive. It bobbed in front of me as he undressed, and I gulped. This was my brother's dick. I shouldn't be seeing it, right?

No. I had to think of it not as my brother's dick but as my doctor's.

Oh, god. I was about to fuck my doctor.

"It's okay," he said soothingly, as though he could read my mind. "I'm a fertility doctor. I have plenty of experience with these things."

Climbing onto my bed, Alex positioned his cock at my entrance. My pussy lips parted easily, and he pushed forward. He slid into me smoothly, and I gasped at the feeling of his thickness.

He pulled back, and his cock stopped mid-way, still halfway in.

"You definitely want to do this?" he asked, looking me in the eyes.

"Yes," I replied. "I… I want to conceive."

With a smile, he pushed forward again, sinking all the way into me. My body protested at the sudden intrusion, but I bit back a cry.

This was my doctor. My brother. And he was fucking me.

I moaned softly as I took him inside, gasping as he filled me completely. He kept pushing until he bottomed out, and I was sure I could feel the head of his cock against my womb.

"Right there," he whispered, his eyes locked on mine. "Do you feel it? That's where you'll be carrying your baby."

"Oh god," I sighed, closing my eyes. My brother's baby. I'd be carrying my brother's baby.

It felt so strange yet so natural at the same time. He was my brother, and I loved him. I’d always dreamed of being a mother; I’d just expected it to happen… later. Much later. Maybe in my late twenties or early thirties.

Certainly not when I was eighteen. And I’d never imagine it happening with my brother.

Still… why else would I have gone to a fertility doctor? I wanted to conceive. I wanted to get pregnant.

And my doctor was right here, ready to help make that dream a reality.

"I'm going to fuck you now," he said, and I nodded eagerly. "I'm going to cum inside you."

"Do it," I begged. "Fill me up."

With a grunt, my brother pulled me close, pressing his body against mine. Our chests mashed together as he thrust upward, filling me up with his thick cock.

"Fuck," he groaned, his hands gripping my hips tightly. "You're so warm. So tight."

I whimpered as he began to move, his cock sliding deep within me. He was bigger than I was used to, but I was so wet, and his cock fit so well. Soon, it would be exploding inside me. Soon, it would be filling me with cum.

My brother's cum. My doctor's cum. Thick ropes of hot, baby-making cum.

I couldn't wait.

"Please," I panted. "Knock me up."

"You like that?" he asked, his hips bucking up and down. I nodded vigorously, and he smiled, pumping me harder. "Good girl," he murmured. "I'm glad you're enjoying this."

I loved it. My pussy clenched around my brother's thick cock, and my toes curled. He was filling me up, and I was ready to be filled.

I needed to be filled.

I needed to be filled with my brother's semen.

"Cum inside me, Alex," I begged. "Fill me up. Fill your sister up with your cum."

It felt so wrong to say it out loud, but there was no denying the truth of my words. I wasn't just his patient; I was his sister, too. And as I lay there on my bed, naked, allowing my brother to fuck me, to put a baby inside me, I knew that this was what I wanted.

I was his sister.

I was fertile.

And I wanted to conceive.

"God, I love you, Tammy," he groaned, one hand gripping my breast while the other grabbed my hip. "You've always been such a good little sister. So sweet and innocent."

Alex's lips pressed against my neck, kissing me and making me shiver. His hips picked up speed, slamming into me hard. I cried out, my body clenching as I rode out wave after wave of pleasure.

“And you’ve grown up to be so hot. You’ve got such big tits. Such an amazing body. And you’re so, so… fertile.”

His cock was buried deep in me, and I could feel his orgasm approaching. He was fucking me so hard; I knew I wouldn't be able to hold back much longer.

"I'm gonna cum," Alex moaned, his voice growing hoarse. "I'm going to fill you up."

"Yes," I cried out. "Fill me up. Fill me up with your cum. With your seed. With your baby."

He slammed himself against me, and I arched my back as I felt his cock throbbing inside

"I will," he promised, leaning down toward me. I opened my mouth to moan as his tongue pressed against mine. "I promise. I'm going to knock you up, no matter how many times we have to do this."

My head spun. Fuck. I hadn't thought of this being a repeat experience… but now that's all I could think of. Any time Mom and Dad were out or even had their back turned, I'd be fucking my brother. Whenever we could, he'd be filling me up and pounding into me, taking me in every room of the house until I was finally pregnant.

"I'll fuck you whenever I can," he promised, pulling his tongue away from my lips. "Whenever we get a chance. And after this baby, I'm going to give you another. And another and another and another. You'll be pregnant for the rest of our lives."

I could imagine it now—constantly pregnant, constantly with child. My brother's child. My brother's children.

"Please," I whispered. "I want to be pregnant forever."

I could feel my brother tense at that, and he unloaded into me. His cock pulsed inside me, shooting load after load of cum into my womb. My insides clenched around him, and I felt myself flooding with his seed.

"Yes," he groaned, throwing his head back as he came. "Fucking hell, yes."

I felt him pulse and spurt inside me, and I cried out as I climaxed, feeling his cum flood my womb.

My body shook as I finished, and I could feel his cock soften inside me. Slowly, he pulled out, and I felt empty and unsatisfied.

"That," he said, climbing off me, "was amazing."

I nodded. "Yes," I moaned. "So… so good. Thank you, Alex."

He grinned, pulling his clothes back on.

"It's what I do, sis. I'm a doctor."