I (30M) and my best friend (26F) have feelings for each other and recently agreed to get married. The wedding will take place in 3 weeks. We don't live in the same country so we've only had sex about 4 times when I traveled home. Throughout our friendship, we've always been open to each other about every area of our lives and I think this honesty stemmed from the fact that we had no plans to date or marry. So we had no incentives to lie and we kept it pretty open. I know she's very creative sexually and she enjoys reading up on different sexual kinks. So recently, we started talking about hotwifing and how I would love to have her sleep with someone else and send me audios/videos as well as provide me with the details. Interestingly, she's totally up for it. She mentioned that there's a guy who has been trying to get down with her for the last two years and one time she was with him in his room and they were both naked, making out and doing everything else except for penetration. Right now, all she's waiting for is my permission to go ahead with it. But somehow I have some fears and I hope that those of you here with experience in this LS can help put my fears into proper perspective.

Is it normal that I feel a mix of excitement and fear while thinking about this?

Since the wedding is in 3 weeks, does it make sense to wait until after the wedding before she goes ahead with this guy? A part of me is worried that I may feel weird about having sex with her in 3 weeks knowing she just fucked someone shortly before seeing me.

How do I cope with whatever negative feelings I may get if they do have sex?

Honestly, I'm super tempted to have it happen right away but I'm also worried about the aftermath. Please provide me advice. Thank you.