I encourage you to read previous chapters to understand characters and context
--------------
Once again I found myself following Rob down the hall to the bedroom, admiring his muscular, hairy body. It still surprised me how much I was turned on by a man, after years of thinking I was straight and admiring women. And the thought that I craved his man body and loved sucking his big cock. I really loved it when he fucked me to amazing orgasms that I never thought possible. And now I am determined to fuck him, my first man ass, and complete my experience of all things gay. I found the thought exciting!
I pushed him down on the bed and ordered him to lay on his stomach and prepare for the best massage of his life. I discreetly grabbed the lube of the bedside table so it would be handy.
I crawled up on him, straddling his ass, and began massaging his neck and shoulders. I was slowly rubbing my rock hard cock up and down his ass crack as I worked on his muscles. After a few minutes I moved down and focused on his back. He was enjoying it, but I was impatient, wanting my first man ass. As I started on his amazing muscular cheeks, I grabbed a couple of pillows and instructed him to put them under his hips to give me easier access to rim his ass. He loves getting rimmed and readily agreed. I kissed his neck and then slowly kissed my way down his tanned,muscular, lightly haired back. It was so different than the wife's pale, soft, smooth back. Squeezing his firm muscles was so rewarding. I finally arrived at his amazing ass and and licked down to his rosebud. He squirmed, pushing his ass up as I probed his hole with my tongue, causing him to moan.
"I love feeling your tongue in my ass. Push it in further."