Dear Makinde! I Slept With My Mother-in-law And She’s Telling Me She Want Us To Do It Again

I had s*x with my mother-in-law on her silver wedding anniversary. It was amazing and she’s made it clear she wants to do it again. I’m 26 and happily married to an amazing woman. She’s 24 and I’m proud she’s my wife but lately her mother’s been showing an interest in me and that’s made me look at her in a new way.
She’s 46 and a good-looking woman. Her husband’s much older than her and I got the feeling she wasn’t too happy at home. I started to think about her all the time, even when I was having s*x with my wife. Things came to a head on the night of their silver wedding do. It was held at a local hotel and was all in full swing when my mother-in-law came up to me and asked if I would drive her back home as her new shoes were hurting so much that she needed to change.
My father-in-law was already well away but I hadn’t drunk much at that stage so I said yes. I looked for my wife, who was laughing and joking with some other man. I told her that I’d just be gone for half an hour but she wasn’t listening to me. Back at her place my mother-in-law put her hand on my crotch. I could see she was drunk and I just moved away.
She laughed and said that she’d wanted to do that for years. She pulled me towards her and kissed me. I felt so turned on that I didn’t fight back. We had hot and urgent s*x and then we went back to the party. No one suspected a thing. I don’t know how I should handle this now. I love my wife but all I can think of is s*x with her mum.
I’m worried as well that she may have got pregnant that night as I didn’t think about protection. Should I confess to my wife or keep quiet and keep seeing her mum?
I really feel I love her now. Please Admin, you guys can advice me or share it on your site but PLEASE DON’T EXPOSE MY NAME OR EMAIL ADDRESS.