It happened in the changing cabin

I never had thought about another man sexually, me and my best friend went to the local swimming baths, we always had got changed together, after our swim we were both naked drying off, outside two girls were doing bending exercises there costumes were very brief with watching them bending over in front of me I got an erection, I felt my friends hand on my dick wanking me and he was pressing his dick against my back, he said are you ok with this, am I complaining I said, he moved his dick in the crack of my bottom and rubbed it against my arsehole and whispered bend over, I didn't need telling twice I herd him spit and herd a squelching noise he was lubricating himself he spat again in the crack of my arse for my lube, he said I am going to fuck you now ok, do it I said he just pushed it all the way inside and started pumping it was only about a minute before I felt the hot liquid up my anus, I did him the same favour, we are both married. that's how it started.