Sit down stepson, we're going to have a little talk. You see I found something of mine in your room. I open my robe and I'm wearing the satin panties you've been jerking off to. I'm going to instruct you how to jerk your cock and you're going to cum all over the panties I'm wearing. I tease and encourage you to stroke. I rub my panties against your cock and you love it! I give you a countdown from 5 and you're going to make a big cummy mess all over stepmommy's satin panties.