Still kneeling on the floor in front of the couch, I undid my belt and unbuttoned my jeans. Maybe the problem really was contagious? I began to unzip. For some reason, I did all of this loudly to be sure that the sounds of me undoing my pants would be heard by my partially naked little sister.
She giggled. “Are your pants coming off now too?” Tina asked playfully.
“Yeah, I think so,” I said dumbly as I awkwardly lifted my knees up to push my pants and boxers down and off. Tina held herself open the entire time. I could not look away.
“I guess it really is contagious…” Tina said thoughtfully.
Now she scooted closer to the back of the couch, giving me room to get onto the couch behind her. So I did. I settled into a kneeling position behind my sister. Tina seemed to pull herself apart even further.
God forgive me: there was no where else for my erect penis to go, so I guided it in between my sister’s open ass cheeks. As soon as she could, she adjusted her body so that the tip of my penis was pressed directly against her asshole. Then she released her grip on her right asscheek, allowing her plump ass cheeks to swallow up about half of my entire penis. It was incredibly warm in between.
“Hm-hm-hmmmm,” Tina innocently hummed an little song as she gently squeezed her ass around my throbbing dick.
“Ewww, is that your peee-nis?” she whispered, still repeatedly squeezing me gently in between her massive ass cheeks.
“Ewww, is that your big smelly butt?” I teased her. She giggled.
Instinctually — not consciously — I tried moving forward and back, but there was no lubrication, and Tina’s ass held me tightly enough that my penis could not move.
Tina opened her ass yet again. I moved my penis away from her anus. For a brief moment, a tiny string of moisture connected the tip of my penis to the center of my sister’s anus, visible for only a second or two as my weiner disconnected from my voluptuous sister’s butthole.
Precum. I had done a precum on my little sister’s anus. I’m a terrible big brother. Oh well…
We needed lube. “Wait here a sec, okay?” I said as I stood up.
“Ooookayyy…” Tina sang as I zipped over to my bedroom to grab a small bottle of lube, which was mostly used up. But it would be enough.
“What are you doing, step-brother?” Tina joked as I settled back onto my knees behind her and popped open the bottle of lube. It was a pretty weird joke, me being her actual full-blooded brother and all. She opened herself back up again.
“Don’t forget meee…” Tina sang as I lubed up the forward portion of my weiner. Tina quickly opened and closed her ass several times with her fingers, indicating the place I should not forget. Oh boy.
I spread some lube over my middle finger and rubbed it all around my sister’s asshole. She puckered it several times. She breathed in a sharp gasp of air when I want directly over her anus. It felt so tight, I pressed lightly against the opening but it was like there was no “give” at all. Lastly, I spread some more lube all around the general area: since I was to be enveloped by my sister’s tremendous ass cheeks, it was a good idea to have some extra lube spread around.
Tina opened and closed her ass repeatedly as I got back into position on my knees behind her.
“You’re such a fucking weirdo,” I teased her, and she responded by fipping her asshole open and closed even faster. Her butt cheeks made a wet slimy noise from the sticky lube separating each time she pulled her asshole back open.
After a moment Tina stopped and just held herself wide open for me. I repositioned my penis in between her butt cheeks, the tip pressed up against her slippery anus. I pushed gently, but no entry was permitted. I pushed a little harder, but still, nothing. I didn’t push any more — I was worried it might slip and go into her vagina. Her vagina was covered by her shorts, but I still worried that my erect penis could push them out of the way and jam itself in and ♫ BREAK ON THROUGH, TO THE OTHER SIDE! BREAK ON THROUGH, TO THE OTHER SIDE! ♫
Which would of course be very weird, to be inside my sister’s vagina. Luckily her anus was not technically a sexual organ, so our current little game wasn’t TOO outlandish. Sure, we had never done this before, but it’s not like we were having real, actual sex. That would be insanely inappropriate for two siblings to do together. Unthinkable.
Anyway, Tina released her gigantic right ass cheek, holding my penis in place with my urethra pressed firmly against her butthole.
“I think if I move it kinda in and out, that’ll help with our whole pants problem,” I suggested.
“Yeah, do that,” Tina said casually. As I pulled myself out of her butt cheeks, she clenched my penis in between them. Not incredibly hard, but it provided some friction and resistance as I pulled away.
Going back in between her massive ass cheeks, that resistance was almost completely gone. I slid back in between effortlessly, parking my weiner again, the tip pressed against her anus once more. The entryway still seemed closed. That was okay — Tina had more than enough ass cheeks. It was kind of like a boob job, but with my little sister’s ass.
_____
Each time I pulled away, Tina clenched her ass around my penis. And each time I went back in, she released, allowing me to push back in effortlessly. This went on for several minutes. I held onto my sister’s right hip with my left hand, and I held onto her right thigh with my right hand. Her body was so very soft – my fingertips sank into her. I don’t normally touch my sister’s body like this — but given the current circumstances, I was pretty sure it was okay.
Eventually Tina began to thrust her ass back into my crotch each time I went back in. After a few dozen times, it finally happened: after pushing myself back in between my sister’s voluptuous cheeks, she thrust herself back a little harder, and the head of my penis entered her ass. I couldn’t see this happen, but I could feel it for sure. Tina hissed in a sharp gasp of air: she could feel it too. I hoped it wasn’t hurting her.
I gently ran my right hand along Tina’s massive thigh. The fingers of my left hand dug slightly into her round hip. Even though only the tip of my penis had entered my sister, it still felt so good that it was difficult to speak:
“Are, are you okay?” I asked her awkwardly.
Tina cleared her throat, and responded: “Is that your penis? Gross… It’s all hard…” she said dreamily, even though she was teasing me. Of course, since she was my sister, she had to pretend that she was grossed out, even though we were technically having sex at that point.
“I think it’s just hard because of the whole weird pants problem we’re having,” I suggested.
“Ohhhh– yeahhhh…” Tina groaned as I pushed the next few inches into her ass. My little sister’s ass. “That must be why,” she added.
“I think this is gonna help,” I suggested. I stared down at the point where my penis disappeared inside my sister’s ass.
“I hope so…” Tina whispered as I pushed the rest of myself into her. Even though the ass was unbelievably phat, I could feel that my entire weiner had made it beyond the phatness, and was fully engulfed within her. Her anus tightly gripped my shaft as I slowly pulled back out of her.
_____
Over the next several minutes, I gradually fucked my little sister faster and faster. Eventually I reached a pace fast enough that our bodies slapped together each time we made contact.
Tina still pushed back against me each time I went fully in. I held her right ass cheek up so I could more clearly see the action. Tina’s shorts had ridden down a little bit, so I hitched them back up for her to conceal her vagina. I shouldn’t be seeing, hearing, or thinking about my little sister’s vagina. That was extremely inappropriate. However, what we were doing was technically okay since it didn’t involve both of our genitals.
But I had caught a glimpse of the lower part of her vagina. It looked like she shaved. I pushed these thoughts out of my mind and focused on the task at hand.
I know I said earlier that we were technically having sex, but… were we really? I mean, if my finger was exploring my little sister’s ass, would that be considered sex? I don’t think so. So why would it be sex just because we’re using my penis instead of my finger? I mean, my sister’s ass isn’t a sex organ.
Tina began to grunt loudly each time she pushed back against me with her massive ass, each time I was fully inside of her. And every time, the impact of our bodies sent waves across her ass, lower back, and thighs.
Her asshole was so tight. Tighter than any other girl I had been with. When the time finally came, I could not find the words to tell my sister what was happening.
_____
“Teen… Teener…” was all I could say as I began unloading deep inside of her.
“Ewwww, are you cumming?” She teased me, but she pressed her ass hard against me.
“It’s… involuntary… it’s not like I wanted to…” I lied. I wanted to.
“Uh huh, sure, whatever. Just make sure you’re totally done before you take that thing out. I don’t want your nasty jizz to get all over me.” she told me.
That gave me a fun idea for a playful and totally innocent way to antagonize my little sister:
“Oh… you mean like this!?” I said as I pulled out of her and stroked the last few spurts of semen out directly onto her ass. They landed on her right ass cheek and slowly dripped down, approaching her buttcrack.
“Eeewwwwww!!!” she squealed. Then I laughed at her. Then she started giggling. Then I got her a towel and we both got cleaned up.
_____
So, that’s how it started.
It’s been a few months since then. I hang out with my sister all the time, and once or twice a week we find ourselves alone over at my place. And, from time to time, Tina’s pants start falling off again and we have to “fix it” in the same way.
Her pants never come down far enough to expose her vagina. I try to tell myself that’s a good thing – fucking my little sister in the ass is one thing, but even seeing her vagina would be far too inappropriate. Just crazy. Completely out of the question.
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