A change in size, needs a change in technique! Help a girl out?

So I've just recently started seeing someone new, and while we have yet to fully enjoy each other, we have had some fun.

Here's the thing. His penis is probably the smallest out of all my previous partners, so I'm not sure what I can do to really please him. It's great for things like oral because I can really go to town without worrying about overstretching my jaw or bumping my gag reflex, but as for p-in-v sex, I'm clueless as to what I can do for him. I'm so used to bigger guys where I had to watch out for myself not to get hurt, that now that I can fully enjoy myself I'm not sure how to go about making it great for him. I also don't have a lot of experience with different positions, so while I've heard some let him go deeper, I'm not sure which ones those are.

Any ideas for positions or movements that I can do to really blow his mind?