He got me to suck him again until he was hard. I was hoping he would suck me too, but it didn't happen. I had no real idea what was going to happen and then he made me lay face down on the bed. I was trembling all over with excitement. He parted my legs and knelt between them, then pulled the cheeks of my arse apart. The next thing I knew his tongue was there, pushing into my bum hole and licking all around. That was intense.
Then he got a jar from the bedside table and pushed a slippery finger up my anus which I loved. After a couple of minutes of this he stopped, lowered himself onto me and started kissing my neck. His cock was throbbing between my buttocks, sliding up and down the crack. I still didn't know what was to come, I assumed this was how gay guys got off.
Then he adjusted his position and put a hand down there to guide himself. I felt the head of his cock press against my bum hole and thought "No way!" He increased the pressure and it started to really hurt and I told him to stop but he said relax, you'll love it.
Then I felt the helmet almost pop inside me and the pain reduced. it still hurt but now it was less, a stinging sensation where I was stretching to accommodate him. He started working it in and out of me, going a little deeper every time until I could feel his pubic hair pressed against my buttocks and the whole of his cock probing my rectum. He rested the whole of his weight on my back and grabbed my slim hips so he could pull himself even deeper inside me. He rested there for a minute then started to thrust in and out, gently at first but getting harder and faster as he got more excited. I was still feeling pain but was also loving the feeling of his cock right inside me and the thought of him fucking me like I was a girl.
He came deep inside me. After he wiped my rear with a paper towel and cleaned himself down. Once it was over I felt bizarre emotions. I felt dirty and degraded, humiliated and used. Now that passion was over I saw him as a pretty gross old guy and to be honest I couldn't get dressed and leave fast enough. I enjoyed those feelings, perversely, and masturbated thinking about him using me when I got home. And from then on I visited that toilet and many others regularly. A few months later I met an older dominant man who liked watching others fuck me and took me to a whole new level.