You finish the shower

The two of you finish washing each other off. Heather keeps you hard with tugs of her hands and rubbing her body up against you. You play with her tits and finger her, making her come at least twice.

You get out and dry off. Heather does the same. God, she has a great body.

"Okay, if you want to be my secret slut, you need to follow my directions. Ashley will be home soon. We're going to have a lot of sex, and you're not going to bother us. In fact, if your mom or dad comes home, you'll knock lightly on the bedroom door to warn us. Part of being my slut is being my lookout."

"Yes, sir!" Heather says with a smile.

"Good. The other thing you can do is call me when you have the house to yourself. I'll come over and pound you. Agreed?"

In answer, Heather gets up on tiptoe and kisses you, her mouth melting into yours. You kiss for a couple minutes, then break away and say, "Good! Now skedaddle!" Heather giggles and heads into her room.

You go downstairs to wait for Ashley.