I'm having sex with my mother-in-law and my girlfriend is on top of me encouraging me to cum inside.

The idea of a mother and daughter having sex with the young woman's boyfriend is becoming increasingly common, and honestly, it's a pretty morbid situation, don't you think? I say this because there comes a point where the older woman is completely exposed, and the young man is going at it, thrusting in and out, and the girlfriend tells him he can ejaculate inside her mother, that she's happy about it and lets him do that...