This is probably gonna get lost in the comments but when I was a teen stud in a rock band I screwed my guitarist wife whilst he was away at hospital visiting their young son who was very sick. I got really drunk with her and we screwed in their bed.. Things got a little wild when I pushed her hands against the wall and rammed her from behind like the stud I thought I was. The next morning we slept In a little too late and this woman’s other 2 children came bounding into the room wondering who the hell this new guy was in their bed and why there was RED paint handprints all over the bedroom wall! Turns out she came on her period during our night of passion and we had smeared blood all over the walls. We had to then run out and buy paint to redecorate the bedroom. Told the kids I was just a friend and had to sleep in the bed due to a bad back. Told the husband we decorated the room as a nice surprise.. Eventually he found out we where knocking around behind his back. All came crashing down at a gig when an ex of mine turned up and the wife got jealous and started drinking and blurting out all our dirty history to everyone. I’m not proud of the role I played in this affair and I never cheated or betrayed anyone again. Still feel dirty about it some 20 years later.