Stag Do With Dad's Best Man

The night went by in a blur. I remember Hunter stood behind me, bending me over, me reaching out trying to hold onto the hotel bathroom's doorframe, but my hands kept slipping with the force of him behind me, jackhammering away. And then him refusing to pull out when he'd finished. He said it was my fault I felt too good, and we fell asleep with him inside me. I woke up in pain, when he got morning wood inside me, and minutes later he woke when my Dad phoned to say we needed to check out. 

Anyways, it was all forgotten about until his wife texted me saying he told her he wants to try fucking a guy. And when she asked him if he had a type, he mentioned me specifically. She said that ever since she asked, he's been screaming out my name when they are "making love". She asked me if I could seduce him. When I spoke to him, he said he wanted to be able to fuck me whenever he could get his hands on me, but that she would never agree to it so it was better if we lie to her so she didn't get suspicious. So I told her I tried, but he wouldn't go through with it. 

I thought I was straight and it was just a drunken thing but now I'm meeting him in the car park of an industrial estate tomorrow so he can take me to this apartment that he rents with a bunch of his mates so they can keep stuff like this from their wives. I'm really nervous? Am I doing a bad thing?