...you start recording

Luckily, you have a good spot to watch. The window facing the backyard has a good view of the hot tub, and it's got blinds that you can peek through fairly safely.

You stick your video camera to the window and record the scene as Mr. Thick and your mom kiss. Your mom's desperately grinding her body against the hung black man while their tongues wrestle, and you find yourself stroking your dick while you watch.

Your mom's slutty behavior has the effect of making Mr. Thick's enormous cock hard, to the point where simple kissing isn't enough.