I don't understand Jose

Jose was clearly a pedo, that's for sure, but I don't understand why he continued to abuse Erik for so long? So he wasn't strictly a pedo I guess (not that it makes anything better) and I guess he was gay/bi? This is gonna sound weird but I'm just confused and trying to understand. Did Jose have some sort of attraction towards Erik or was it all just to "get his needs satisfied"? Not only does Jose disgust me, he also confuses the hell out of me. But I already know that nothing makes sense when it comes to both him and Kitty. A part of me thinks it wasn't about the sex, it was just about power and controlling people. But why do it with your own son too..