First-time poster here. I love reading all your thoughts about cocksucking!
I'll suck any man as long as his dick doesn't smell dirty (unwashed more than a day, shit on the stick, etc.). I'm too fat to kneel at holes anymore, so always suck sitting down in theaters, either on a bench or one of the cocksucker chairs behind a wall.
Older guys seem more willing to enter into a fun little temporary "relationship" - I enjoy his body, kiss his stomach, test his nipple tolerance, we might hug and make out for a while (some guys seem to enjoy that more than the blowjob), I'll go back to his cock, reach around and squeeze his ass, maybe finger his hole while I start to suck, run my hands down and squeeze his muscular thighs. I like to hug his body to me as I suck and especially when he cums as an indication that I really want his load in my mouth. And to feel his warmth and take in his scent.
Younger guys often just want a pump-n-dump, which is pretty awesome too. Whatever gets the cum into my mouth 🙂
A smaller dick means I can get more into my mouth and maybe even press my face all the way into his hair (the more the better), especially if he has that musky "at work all day" smell! Ball sucking can be difficult while seated in a chair if he's standing, but I'll do that if possible. I don't rim, but will go as far as licking and massaging his taint when the opportunity arises.
He's welcome to enjoy things however he wants. Longer guys will occasionally take control and fuck my throat. The only drawback there is that I don't get to taste/feel his cum.
My all-time favorite suck was a young black guy who came into my booth in an arcade. About 6 inches cut, hard as a rock, flat belly, muscular ass, thick hard thighs, could just barely get my nose into his short wiry hair. He was a "just stand there" sort of guy, which lets me play a little more. And he had the mildest best-tasting cum I've ever swallowed.
Sorry, I could probably go on all day 🙂 No size hangups here.