Its common when sis has a break up with her BF, she finds solace in the arms of her step bro which will eventually lead to a sexual relation between the two. Thats what happened here at least. Anyways I taught my Step Sis to suck Cock Deepthroat which will help her get a new BF and not have a quick break up and then I also fucked her hard to open up her pussy for other boys.