When a "stranger" isn't a stranger... What would you do?

I'll try to keep this short. I messaged a couple and arranged to meet. I'm 49, the male half of the couple us 41, his female partner 22. 

Met the guy, arranged to go to their place and his partner will be blindfolded. Had a great time. 

Fast forward a cpl months and I'm at a friend's place... The penny drops.. The 22 year old I met a few times is my friends daughter... Who I've known since she was 10. 

I never recognised her with the mask on. 

The guy has messaged me to arrange another session but I can't commit. As good as the sex is.... Fairly sub dom... I feel like a cunt but am I just having a hang up about nothing? 

Any thoughts would be appreciated 

was it a dream 

Ha.. V funny. Its a serious post

People grow and develop. She’s obviously more developed than you’d imagined. You’re both contenting adults!

Does she know or recognise you, if so its possibly part of the turn on, if not, if not, if the sex is good....carry on, love it!

No recognition. Thankfully. If I'd only known her for a few years I'd not have an issue. But I knew her when she was 10. So sadly I think I'll close that chapter 

If you are struggling to live with it, perhaps the best decision! Good luck

look if you feel uncomfortable then that says you need to not repeat.  You had fun at the time and each of you consented.  It isnt something that you need to feel bad about in any way.  

If she is always going to be blindfolded then I don’t see the problem.

I think you have to listen to your gut feel. If it doesn't feel right, why do it?

Leave well alone it's your mates daughter, have some respect

This topic reminds me of a visit to a club after a SH munch a while back, in which there was a completely dark maze and people doing things with who knows who. The whole point was we knew there was a very good chance that whatever you were doing you were doing it with someone you knew but you weren't exactly sure. The not knowing was the key to the adventure, and it occurs to me that the woman referred to in the OP may have liked being blindfolded because she fantasised that her 'stranger' was in fact someone she knew, but she didn't want to be certain. I think it's a bit unlikely therefore that she would be freaked if she found out that she knows you - I think that's probably the whole point. For all you know, it may be you she's fantasising about. Personally I wouldn't be deterred by the fact that she's the daughter of a friend - everyone is someone's child. If everyone's enjoying it, I'd carry on but not tell her it was me, let her keep her fantasy.

Walk away. Your own sense of morality has already told you that it's not on. You either respect your mate or you don't. No amount of 3rd rate arguments would explain your actions, should you ever have to confess.

A friend once confessed how he almost fucked up his marriage by arranging a similar scenario. Wife was bound and blindfolded on the bed and he invited a 'stranger' to fuck her. That stranger turned out to be someone from her past that she hated. He took great enjoyment in approaching her later and identifying himself .

if you respect your friend then walk away, how do you think he would feel if he knew you were fucking his daughter who you have known since she was 10!