Sounds kind of like the Ballooning technique without the ejaculation control.
I do notice that i am thicker and sore (depending on the mood of activity) after sex.
I have been practising an old porn I saw where a guy pulled out occassionally to do what looked like an erect bend than stuck it back in. I do it with Uli’s. I can get about 8 10 sec Uli’s in per encounter. Although i wouldn’t do this with someone fairly new, I’ve been with her for a few years so she knows I move around a lot.