Visiting my friend

i called to my friends house a few days ago. He's a mature guy in his late 60's and always keen to get into bed.
I just went straight to his bedroom while he finished off something he was doing. I got undressed quickly and waited for him on the bed. I was hard with anticipation and when he came to the room, I was posing for him.
He just started to undress and it was great to see him get naked. His big hard cock popped out of his trousers. When he was naked he walked to the bed and I lay on my back as he climbed on me. I wrapped my arms around his back and wrapped my legs around his waist.
I could feel the tip if his cock pressing against my asshole, a great feeling. I stopped him for a second while I lubed up a bit. We started again and he pushed his cock against my assailed again. He pushed I a bit and then out again and kept doing that, just in and out, opening and closing my asshole.