Since you're clearly obsessed I have to ask if you've looked into implementing HDT physics into nipple penetration. Maybe try your hand at making a custom skeleton that gives the lipples articulation. If you did then you could do a lot more than just post gallery after gallery of static posing, and the lipples would actually do something. Hell you could probably just convert the animated vaginas with whatever texture you're currently using. Ask around on this forum, I'm sure someone will show you how. https://www.loverslab.com/files/file/2476-all-in-one-hdt-animated-pussy/
I just want there to be some direction for all this effort.