I've had a deal in place that when my son does something positive he gets a reward. He shows me his grades for the semester and they are so good he gets a reward. He has such a hard time choosing between having fun with my mouth or my boobs that I finally decide he can have both. We move to the bedroom and I lay down with my boobs exposed. He straddles me and fucks my mouth and tits until he cums in mouth and on my breasts.