You were browsing online late at night in your college dorm, while your roommate Gabriel was soundly asleep. You were looking for something fun to prank Gabriel with. You felt tired after a while but still didn't give up searching for something. Eventually you found a sketchy site that was selling "magical" items. You thought there was nothing wrong with checking it out. You browse through the online magical shop store, when you see an item called Box of Tentacles.
You click on it and see that the box contains tentacles "no duh", you thought, you assumed that the "tentacles" are fake and from the image it looks like the tentacles jump out, "perfect you thought. You immediately bought it before going to sleep.
You wake up late knowing you didn't have anything going on for today. You notice your roommate has already left to go about his day. You know his schedule for the day and know he will be back within 2 hours. You go about your morning routine, when you finish eating breakfast you hear a knock on the door. You go to check it out, when you open the door you see no one, but as you look down and see a box. You take the box in and realize it is the Box you had ordered. You had expected it to take a few days to get to you, but this works out better. You quickly set your prank up, you alter the box as best as you can to make it look like a box from a store Gabriel tends to get things shipped from and you place it on his bed. You wait for awhile, when you decide to check if Gabriel was returning by texting him asking.
He texts back saying he is on his way back. You smile with excitement. You decide to hide yourself in the closet so you can further scare him. Some time passes and you hear him entering. It takes awhile, but you see him enter the room and see the box. He goes to check it, before placing it on the floor. You see him open it.
Your eyes go wide as you see tentacles shoot out from the box and grab Gabriel. You hear him yelp in fear as the tentacles lift him up above the box and begin to molest him. The tentacles rip of his clothes and caress Gabriel's nude body. You stay quiet in the closet, fearing if you are heard the tentacles would go for you. You see the tentacles then begin to rape Gabriel as he struggles to free himself from their grasp. Two tentacles enter his ass, one large one shoves itself into his mouth, two play with his nipples, and one strokes his cock. After some time the one in Gabriel's mouth pulls out allowing Gabriel to cough out some fluid. You notice Gabriel's body shiny with some sort of fluid.
You then witness something amazing as Gabriel begins to change. You see his cock and balls shrink and disappear, getting sucked into him and becoming a vagina. You then see as two breasts push out of his chest. You witness Gabriel change from a man to a woman, his body becoming that of a very average women. Gabriel now had C-cup tits, a cunt, a round ass, wider hips, thinner waist giving him now her a slight curve, nice lips, ass length light brown hair, green eyes, and a higher pitched voice. You then see Gabriel seemingly change from struggling against the caress of the tentacles to giving in.
You stay watching as you see Gabriel start to moan in pleasure as she was molested and fucked by the tentacles. During this at some point your hand went to your crotch and you started masturbating. You masturbated to the show in front of you. Eventually both of you reached your climaxes. You manage to keep you orgasm silent, while Gabriel moaned in her new voice. The tentacles then lowered Gabriel onto the floor before some withered away and the rest returned to the box, closing the lid.
You breathed heavily still recovering from your orgasm.