Dominatrix tips/positions for a male sub??

Hi, so I'm a domme, but I mostly top girls. I got a guy recently who's hella a sub, and while I love it, I just don't know what to do other than riding. :/ does anyone have any suggestions? I've spanked him, degraded him, and even stepped on him, but when it comes to fucking, there's not much variation. Anyone have any positions for a domme and a male sub?

P. S. I already have the domme attitude and have dommed girls in the past, so advice about confidence, dressing up, etc.. While I appreciate the thought, it won't really help, honestly. :/ I need positions or any other ideas.

Thanks in advance and sorry if I sound too bitchy.