john catching sam and dean having sex. both of them expecting disgust, disappointment, violence but john just tells them to continue for him. john who always wanted to fuck sam but couldn't because he had to keep him pure. turns out he didnt have to worry about that, so why hold back now. john jerking off while sam and dean continue, unsure and embarrassed, until dean gathers his confidence and starts fucking sam in earnest again. sam just taking it and trying not to look at john, because his whole rebellious act just flew out of the window. john edging himself until dean comes inside sam who's gone soft again. dean realizing john waited so he can have a turn with sam, and he tries to protect sam "i think hes had enough for tonight, sir". moves to help sam get up and go clean up in the bathroom with dean, but john just gives him a look and dean backs off. sam too out of it to even know whats going on until he feels his dad behind him