SIL has made me rethink

I’ll cut a long story short but 2 weeks ago I was with my SIL, friends and the wife.. everyone but the SIL went home and my wife went to bed. Me and we’ll call her Amy(SIL 38 yoga very fit and a tight body) were drinking more and we spoke about kinks in the bedroom and I’d said about waking up to a BJ and later I passed out and she was sucking me off and I wake up like “wtf ah wtf ,Any!?! “( but my cock was hard as fuck) and so I just pushed her head down and face fucked her for 30-45 seconds and cummed in her mouth. I M25 am so confused on what to do but it was hot but I have never cheated ( I’ve messaged)