This is a Master PC Story
Adam discovers a computer program that allows him to become a virtual god to the people around him, allowing him the power to bend their reality to his specifications. This is the original Master PC tale that created a Universe!
Cassie has a great idea for a Halloween costume, a blank outfit on which her friends can doodle and create their artwork, turning her into a human canvas. Unfortunately she did not quite anticipate how much all of that touching was going to turn her on. Luckily for her, a couple people at the party are willing to help her out!
Carmen is tricked into switching bodies with a 6-inch-tall shapeshifting sorceress named Areola who then proceeds to have sex with Carmen's brother and mom.