a happy hook-up

I was sure that Craigslist could bring me nothing but despair and regret, but then came perfection in hook-up form. I wasn't looking forward to it, thought about canceling, so absolutely no expectations, 1st point. I buzzed him in, short and stocky, cute, 2nd point. He said he was looking for a jack-off bud in his posting, which isn't really my thing but it sounded simple. Instead of getting right into jack-off mode, we kissed and there was what they call in the movies, chemistry, and score! Very unlike my date from a few days ago in which there was no chemistry. I tried, but couldn't get into it. I worried that I might need Viagra already, or just indulge those celibacy fantasies. I like him, let's call him Willcock, because he's funny and smart, not a typical castro clone, and a bit weird. He is a bit young though and probably very demanding in a relationship. He said he doesn't mind that I'm a "shim." If that's not chemistry, what is? I was almost getting there when he tried to dominate me, gaging me with his cock and spanking my ass. But then I would just have to laugh because I couldn't take it seriously. What's a shim to do?