I Let My Younger Brother See My Wife Naked On Purpose

Alright so, staying with my parents for a bit of a vacation, myself and my wife (both mid-late twenties) and everything is normal. I've got two younger siblings, a brother and sister, and my brother is naturally a bit of a perv given he's more than a decade younger than me and a horny teenager. He's not exactly subtle about it, and I don't really care or pay much attention to it honestly since I know what it's like to be his age so I just kinda ignore it when he ogles my wife or makes an excuse to hug her or rub against her. I figure no harm no foul and my wife doesn't seem to care or notice either as far as I can tell.

So anyway, first night here we're getting ready for bed and since my parents went to bed early, we fooled around a bit. Kept quiet as best we could, and after our fun I went to go clean up before sleep, with my wife staying in bed naked and playing on her phone. I put on my robe and went to leave and heard footsteps, and caught a glimpse of my brother running back to his room that's close by, and it clicked that he was probably listening to us have sex on the other side of the door. His door was still cracked and I figured he was on the other side hoping to not get caught. Not sure why I did it as it was just a spur of the moment decision, but I just left our bedroom door cracked open instead of shutting it back and I headed for the bathroom. I was in the bathroom a few minutes and came out, and saw him bolt away from my bedroom door as he heard me coming, naked as can be. I got a very brief glimpse but there was no mistaking that he was hard and had been masturbating as he peeped in on her.

I feel guilty about it but havent told my wife and don't know if I should just not mention it to anyone or how he's going to act, but wanted to get it off my chest.