Imagine a teenage boy so eager to eat cum that he licks his older sister when she comes home from dates with her boyfriend's semen in her.
Even kinkier, he's a cum addict because his parents trained him from youth. They watch him clean his sister and especially appreciate when she sits on his face to drain her pussy into his mouth. She often cums on his face.
Afterward, the boy would jerk off, and his sister would feed him his cum from her fingers.
