My sister's boyfriend loves to fuck with me

He claims to be straight, but whenever he can he sneaks away and comes to have sex with me. that day he sent me a message saying he was coming to see me, i knew exactly what he wanted and that's why i was waiting for him naked. as soon as we arrived we began to kiss and he went directly to suck my cock. i know he is my sister's boyfriend and that she loves him very much, but damn, that guy also puts me on it, it will be a family thing. the point is that he does not want to leave my sister, but he also does not want to stop fucking with me, so while the thing lasts we will continue to do it.after playing with my dick for a while then it went to my ass. what he likes is to penetrate me, i suppose that's why he claims to be straight, because he likes to put her in. but i love to feel it inside my ass, so we are both more than delighted by it. he always fucks me with rubber, i suppose for the reason of being scrupulous due to possible infections. but he loves to cum on me the bastard.