Teaching my girlfriend's son anal!

He was already allowed to fuck my pussy, now it was time for him to fuck my anal as well, so I woke him up and asked him if he wanted to have some fun. We cuddled and I asked him if he wanted to fuck my ass. He's never done it before but would love to. So I taught him how hot it is to fuck anally and to shoot his cum in there too! Lots of cum even ran out of my butt. He was then allowed to sleep on!