That was so fucking hot.
Part of you was terrified by the eldritch horror that you unwittingly unleashed upon your roommate, but you also couldn't deny how incredibly turned on you still were. Perhaps even a bit curious...
But no! You had to make sure Gabriel was ok, but first you had to make sure the box was definitely shut. You opened the closet door, took a step towards the box on the bed... and tripped over the trousers that had pooled by your ankles while you masturbated. You put your hands out to save yourself, but you ended up hitting the box off the bed instead. You saw the lid open almost in slow-motion as you resigned yourself to the inevitable.
The tentacles burst from the box, lifted you into the air and plunged straight for your most sensitive places. Strangely, you weren't scared, as you knew what was coming. In the absence of fear, you realised you were actually enjoying this! You looked down as a tentacle wrapped itself around your penis. You gasped, "Might as well enjoy my last time with you, budd-!". You were cut off by a tentacle shoving its way into your mouth just as a tentacle plunged straight into your ass. Your eyes went wide and you moaned as the tentacles ravished you. You had never felt such pleasure before. The full feeling of the warm tentacle in your ass thrusting against your prostate, the slippery sensation of the one caressing your cock, and the intimate entanglement of the one in your mouth, like a passionate lover's tongue - or a cock. Despite literally just masturbating in the closet, your cock had never been harder, and you could already feel an orgasm approaching as two more tentacles started to stroke your nipples, giving you sensations you had never felt before. The pleasure kept building and building, until-
You blacked out for a second as the most unimaginable wave of pleasure ripped through your body. You heard someone moaning in ecstasy. You opened your eyes to see the tentacles caressing your body, your skin on fire with sensation as they covered you in a mixture of slime, sweat, and cum. A tingling rippled through you, and you gasped as it concentrated itself on your quivering manhood. Still half delirious from your orgasm, you giggled as you watched your manhood start to shrivel down inside you. Your giggle quickly transformed into a moan, as the tentacle wrapped around your penis started to unravel and press down your rapidly diminishing member. You felt your foreskin pull away from the shrinking head of your penis at the same time as your balls shrank down and started to move inside you. You heard a wet *shlick* as your scrotum split open and transformed into lips and your moans grew louder and more urgent.
The tentacle started to ripple back and forth against what could now only be described as your mound, and you started to notice more of your body start to change. Your thighs plumped up, squeezing oh so pleasurably against the tentacle between your legs. Your ass grew to bubble-butt proportions around the tentacle still plunging in and out of your hole. Your waist pulled in slightly, your arms thinned, your body hair fell out - you even felt your face change. Everything was happening in an instant, but time was meaningless to you. You heard your voice start to rise in pitch as the tentacles started to suck on your sensitive nipples, pulling them out into glorious D-cup breasts. Then, finally. Just when you thought you could take no more, you felt your tiny penis finally give up and turn into a smooth, sexy clitoris, and your balls reach their final resting place as ovaries next to your new womb.
As if the tentacles could sense their work was finally done, the one that had been massaging your mound froze, barely giving you a chance to register, before it plunged deep into your new depths to play. Your eyes rolled back in their sockets as you screamed your way to your first female orgasm, too dazed to realise the full implications of what had really happened. The tentacles finally lowered you next to Gabriel, and withdrew from your body back into their box. You lay there panting, eyes fluttering.
A quiet moan came from beside you. "Dude... what the hell happened..."