A guy moves into the house of the woman he's engaged to. They are around 18 or early 20s. He gets along with the family really well. Especially the oldest sister. One night there is a party at the house and he accidentally gets drunk. Not knowing the drink had been spiked. And he ends up sleeping with the oldest sister. They end up trying to stay away from one another for a while but then end up having sex every now and again.
One night after the fiancee passes out after taking pain medication the oldest sister has sex with the guy while he's laying next to her sister. Just before he orgasms inside of her she tells him that she is carrying his child. She's not sure but she thinks it was from their first time.
