It's not about size it's about sensitivity. I might not know what to do with boobs but at least I know something about them 8-)
I once dated someone with smallish a maybe b cup boobs but massively swollen nipples when turned on. That was a match that didn't last though.
Haven't seen naked adult boobs since I lost sexual connectivity with my second ex after she got pregnant with our daughter in early 2017 and all sex and intimacy ceased.