She Was Never Just My Sister[R18]

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Chapter 3

It was tough, but I managed it. By the time Thursday actually rolled around, I had built it up in my head as the most epic masturbation session ever. I started to get hard in class even just thinking about fapping. Luckily, I was seated way in the back of the class and was able to force other thoughts into my head by the time the class was over.

I missed my bus because a friend was talking my ear off, and I didn't feel like I could say, "Shut up, I need to go touch myself," but it was only a ten minute walk, which would leave me an hour and fifteen minutes once I got home. Even longer because, although it was a ten minute walk, I broke into a run for the home stretch.

Once I unlocked the door, I kicked my shoes aside and stopped in the bathroom for the hand lotion dispenser. Usually I didn't need that, but I wanted it to feel extra nice this time, since it might well be my last time before the challenge was over. Then, in my room, I pulled my shirt off, and then my jeans and underwear, and lay down over the covers. Normally I didn't strip naked just to jack off, but I feared with all the cum I'd built up, I'd spray all over the place like a fire hose.

With one hand I grabbed a few tissues from the Kleenex box on my nightstand, and then I lubed up my other hand, and got to work.

I was only a few seconds into it, feeling good as it usually does, when I heard a sudden creak and a gasp. My eyes opened, and there was my sister, standing in my door. One of my worst nightmares, come true, especially as the look of shock slowly transformed into an amused smirk. "What the fuck?" I cried as I covered my dick with one hand and groped around with my other for something to cover it with. "What are you doing home?"

"Tumbling was cancelled."

Shit. Just my luck. Maybe I should have paid more attention to the morning announcements. "Well, don't you ever knock?"

"Sorry, I wanted to see if you wanted to play cards or something to kill time. I didn't think you'd be doing… that. Don't you usually do that at bedtime?"

I stared in horror. She knew. Who else knew? I'd found a pillow and covered myself with it, still, unfortunately, hard. I wish I could cover my face with another pillow, it was burning and almost certainly bright red. I hated people seeing me blush almost as much as I hated whatever caused me to do so in the first place. "What do you know about it?"

"Come on, it's hard to miss." She pinched one of her cheeks with one hand and pulled it out, flapping it back and forth and making a sound a lot like my masturbating. "My room's right next to yours, and we share a vent, remember?"

We learned as kids that if you listened through that shared vent, you could hear quiet conversations in the other room… but you would have to stand on top of your bed with your ear right next to the metal. The little sneak. "Get the fuck out," I said.

"Fine. I'll let you get back to it…" She turned to go, without even the courtesy to close the door, but stopped before she was completely out of sight, paused, then turned back. "Hey, Bobby? Can I ask you something?"

I groaned. "What?"

"Why are you doing it now? I mean, you just came home like a minute ago. What's the rush? Was there like a really hot girl at school or something?"

Well, there was Mary Flannigan in History class, the girl I'd planned on imagining while I rubbed one out. But I was afraid if I admitted that, it might get out to her. "No, it's just…" I didn't know how to explain. "Guys need to do it every now and then."

"I know. More like every night, right?" I was quiet. "You haven't been doing it lately."

"You know, this isn't exactly the kind of thing I want to be talking about with my sister…" It felt like the extreme flush my face had developed when she barged in was starting to fade, but only because, like an erection, a blush couldn't last forever. The erection had started to shrink as well.

"It's cause of Mom, isn't it? And her Unplugged Challenge?"

I grimaced. Well, she already knew I'd been masturbating. It wasn't that much more embarrassing. "Yeah, it's just too quiet. It feels weird. Like people might hear."

"Oh," she said, as though that was a revelation. "I know how that is. I thought it was just because of there being no Internet porn."

"That too." I thought back on what she said. "What do you mean, you know how that is?"

Now it was her turn to blush, although it was milder, cuter. "Girls need to do it too you know."

"You do?" I suppose it wasn't really a surprise, but it was a surprise about my sister, who I'd never thought would, and certainly a shock to hear her admit it.

"Of course."

"Well, at least you don't really make noise."

"I do so. Maybe you just don't hear it. But since it's been so quiet I've had to be really careful too. It's not as much fun, and I can't use my toy."

"What?"

She blushed again. "I have a thing one of my friends gave me for my birthday. It vibrates. But I can't use it now. I had to hide it really well so Mom wouldn't find it during her purge."

My sister, with a vibrator? I had sometimes heard buzzing coming from her room before, but I always just assumed she was shaving something, or curling her hair, or something else that was in the category of "girl stuff". Now, though an image of her shoving a long slender rod into her pussy while it shook furiously formed in my head. My cock began to stiffen. I didn't want it to. "Why are you telling me things like this? I do not need to know stuff like this."

"I don't know, you're all red-faced 'cause I caught you doing something embarrassing… I thought it'd make you feel better."

It did, a little, but in another way it made the situation more uncomfortable. "Fine, just, could you go somewhere else for a few minutes?"

She looked at me. "Okay, but… don't you need something to look at?"

"Like what? You got a Playboy magazine stashed somewhere?"

She raised both her eyebrows and widened her eyes, giving me a look that expressed how she couldn't believe I wasn't getting what she meant. "No, dummy." For good measure, she pointed at her chest. There was only a slight bulge beneath her shirt, but it was still obvious.

"You?" I asked incredulously. "But you're my sister! Are you sure you haven't been watching the Jerry Springer show?"

Her face fell, and she turned to leave. "Fine, forget I asked."

I called after her, "Wait!" She slowed, then stopped, then turned, though folded her arms across her chest uncertainly. "You'd be willing to do that?"

She shrugged. "It's not like I've got anything else to do. No TV, no Internet, no phone. Not allowed to go out." The shrug appeared again. "It's this or homework."

"Well, I don't want you to have to resort to doing homework," I joked nervously. "Go on, then." I was now staring at her tits, as though I could already see.

It seemed to me to take forever, but it was probably only a few seconds before she lifted up her shirt over her breasts and used her chin to pin it there.

She wore no bra, which was a pleasant surprise. Then again, her tits were never that big. They were probably an A-Cup, and though they had a pleasing roundness to them and a good shape, they weren't the huge knockers I usually looked at. Her nipples were light pink, fading out gradually towards the skin, and they even seemed to be a little erect. Size aside, the tits looked almost perfect to me, except for the small triangles of slightly paler skin. Yet the tan lines somehow made it more erotic to me, as though highlighting the fact that I was seeing what I'd previously only seen covered by a swimsuit.

My growing dick fought against the pillow in front of it. It was probably harder than it had ever been, as though the fact that it was my sister made it more exciting than anybody else I'd ever seen. Still keeping one hand on the pillow, I moved my other underneath it and began stroking.

Krista grimaced. "If you're going to do it like that, I'm going to go."

"What?"

"Under a pillow? Really?"

"You want to see?" I gaped. "But I'm your brother."

"So, I'm your sister, and you're looking at me. I can just pretend it's some other guy, that's what you're doing with me, right?" She thought about what she said and corrected, "Well, but some other girl."

"Yeah," I lied. It wasn't really that she was my sister that made me hesitate. It was a part of it, but mostly it was just my own anxieties. I'd never shown another girl my erect dick, much less masturbated in front of them. I didn't even undress in front of other guys if I could avoid it. I slacked off in gym class almost solely so I wouldn't build up enough sweat to really need a shower afterwards. Like most of my anxieties, there was no particular reason behind it except raw, unfocused fear of what other people might think of me. I didn't know if my dick was normal, too small, too big, looked funny, maybe even smelled funny, or anything like that. I assumed it was probably too small, but I didn't want to be told it. Especially not by my sister.

"So, let me see. I'm showing you my tits."

I still didn't want to show her. So I tried to make excuses. "Yeah, but tits are nothing. You can see tits in PG-13 movies. Masturbation is like a sex act."

At first that's all it was, an excuse so that I wouldn't have to show her. Either she'd accept it and stay, or leave and I could fap to the memory. Her response surprised me. "So, what, I have to do it too, to make it even

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🎉 Big News & Big Love! 🎉

First off, let's give a HUGE shoutout and a warm welcome to our newest paying member...

🌟 ✨ zack_34y ✨ 🌟

You've officially joined the family — and I couldn't be more thankful! 💖

Your support helps keep these stories going strong, and I'm so glad to have you on this wild ride with us. Welcome aboard! 🚀

Now, for everyone else who's been enjoying the stories…

📢 Come join the fun on Patreon!

By subscribing, you get: 🔥 Advance chapters — skip the wait, stay ahead

🖤 Unfiltered content — bold, raw, and uncensored

📖 A few full fanfics free to read

⚠️ And if a story gets banned? Don't worry. I'll keep posting it for free on Patreon

👉 Join here: patreon.com/Forbidden_lust

Supporting on Patreon doesn't just unlock content — it keeps the dream alive, helps me write more, and builds a community where our favorite stories live on without limits.

Thanks for reading