Its definitely a thing. Some call it cock warming and others call it soaking. For confusing reasons, both terms are used to refer to non-motion PIV or non-motion oral - but there is not always agreement on which of the terms that refers to which of the circumstances. I'm definitely one of those guys who enjoy being on the giving end of this type of arrangement. But in reality I absolutely get something memorable for the trouble and it's not a giver-receiver thing for me and I think of it as definitely mutual. The longer the better, as far as I am concerned. Just to offer you some inspirational ideas besides just doing it as an enhanced cuddle, you can also sit on him while watching a movie …or reading a book …or eating dinner it's one of those times where competitive Mario Kart can be taken to a whole new level (and if you like the idea of that) you can also use his as grown woman's version of a pacifier when you want to sleep. (But, there is a consent talk surrounding that, that you can't overlook.) Another line of thought worth exploring is that if you sit on top of him without getting him out after you've spent him, he'll eventually regain his shape again. When that happens, you'll be the first to know.

Thank you for the detailed answer, and I loved the suggestions!. I wouldn't mind any of them. Slightly related, I used to play D&D with a DM that just fondled his girlfriend's breasts as we played. I always thought that was cool (I guess you can figure out that I love physical contact), but I don't know about doing that in a group setting. But just sitting around watching a movie like that would be awesome.

My wife and I call it "cuddle boning". Also call it "loitering".

My wife and I do this nearly every time. It's the most pleasurable part of sex for us. Don't misunderstand—the active fucking is incredible, but cuddling while we're still physically connected is next-level for us. It's a thing. You're just fine, OP.