"Make him masturbate in front of us"

"Let's make him masturbate in front of us. I wanna see him kneeling at our feet and tugging his little dick as he thinks about how easily he lost to you."

The daughter chimes in with more enthusiasm than you think is warranted, and the mother smiles, obviously liking the idea.

"That sounds good. I've beaten him physically, and once he's squirted his load on the ground at my feet, I'll have beaten him sexually as well. Well, you heard it, boy. Come kneel on the ground between my legs and pull out your worm."

The mother stands confidently, legs slightly apart as she gestures at the ground in front of her feet. You panic a little at the thought of having to do this right out in the open, but she doesn't look like she's accepting any refusals.

"Hurry it up boy. Whip it out yourself and you can keep most of your clothes on. Make me wait and I'll tear them off you."