For my first time, I turned into a complete beast.
I simply devoured pleasure, using my sister’s body solely to satisfy my desires… pumping load after load of cum deep into her womb.
I fucked her in every position I could manage — missionary with her legs over my shoulders so I could drive even deeper, doggy style pounding her from behind while her ass cheeks rippled with each impact, and cowgirl where I held her hips and slammed her down onto me repeatedly.
Her heavy F-cup breasts bounced wildly with every thrust, and I buried my face between them, sucking and biting her nipples as I filled her again and again.
Honestly, I had seen lots of erotic manga and anime and had many things I wanted to try—different positions, plays, etc.
I had planned to experiment with my sister tonight.
But in the end, I had no mental capacity to think about or remember any of that.
All I could do was thrust and pump my hips.
Everything else had completely vanished from my mind.
The wet, obscene sounds of flesh slapping flesh and her pussy squelching around my pistoning cock filled the room as I lost myself in the endless pleasure.
From the front, from behind, changing positions however I wanted, sweating profusely as I clung to her, lifted her, and drilled deep inside… each penetration sending waves of intense ecstasy through me as her hot, silky walls massaged and milked my throbbing length relentlessly.
I greedily devoured the unprecedented pleasure all night long.
When I finally came to my senses… it was already past 3 a.m.
My breathing was ragged, but my hips kept moving with small, trembling thrusts.
I could feel the last remaining drops of semen flowing out through my cock.
I was amazed at my own endless sexual stamina.
I had no idea how many times I had cum.
I had barely pulled out at all.
Looking at the amount of thick cum leaking from our joined parts and staining the bed… just how many loads had I pumped into her?
Can a human really produce this much semen?
And despite being fucked so thoroughly… my sister really didn’t wake up once.
(But shit… this much is probably impossible to completely hide…) Even with the special material, there’s a limit.
I planned to clean up thoroughly… but I started worrying it might be noticeable.
For now, I wiped her body carefully with wet wipes, removing as many traces of sex as possible.
I wiped away the cum that kept flowing out… but what remained deep inside was impossible to remove, so I left it.
…She had sex with her boyfriend during the day, so even if some leaked out later, she might think it was leftover from that.
That was actually part of my plan when I fucked her tonight.
As for the sheets… because I had been going at it for so long, even after wiping, faint stains and the smell remained.
The stains might disappear when dry… but the smell… well, maybe she’d think it was remnants from her daytime sex?
The material was special, so washing would probably remove it… but she’d probably notice when she woke up… Damn, I should have bought the same sheets in advance… but it’s too late now.
If she finds out… then that’s that.
I cleaned up the traces as best I could, sprayed deodorizer, dressed my sister again, pulled the covers over her… and left the room carrying a mix of slight anxiety and deep satisfaction from having emptied my balls completely.
As I was leaving, I glanced back… at my sister’s face illuminated by the nightlight in the dim room.
She was sleeping peacefully with calm, even breaths, completely unaware of what had happened while she slept—her face innocent and unchanged from the beginning.
Seeing that pure sleeping face, a dark sense of accomplishment welled up inside me at having dirtied my sister… but I deliberately ignored it and finally left her room.