Set them up

"Joyce, tomorrow morning you will go out and buy the shortest tightest skirt you can find and a very tight halter top and the sluttiest pair of heels you can find. You will dye your hair platinum blonde and fix your hair and make-up as slutty as possible. You will then buy a vibrator and a dildo. You will drive to then drive to the truck stop/motel on the edge of town, rent a room for the night and leave a key for Boris. You will not question these actions; you'll just do them. Now go back to bed."

Joyce left.

"Buffy, when you wake up tomorrow, you'll be hornier than you have ever been. Nothing will be able to get you off and the longer you're awake the hornier you'll get. You will tell no one of this. If a man named Boris comes to your door, you'll notice he's the sexiest man you have ever seen and you need to be his submissive fuck toy. Now go upstairs, get in bed, relieve your bladder then go to sleep."

Buffy went to her room and Boris left.