Uh, also I'm still not sure why cumflation caps at 1000ml and why the cumflation stat wont gain XP, it still feels like I'm doing something wrong or that there's some hidden mechanic I'm tripping on.
(EDIT: caps at 1500 for the player's stepsis, it looks like.)
(EDIT 2: kinda looks like the stepsis just works. I don't think it's working for anyone else though.)
Even tested a non-cheated save, maxed satisfaction, maxed the vaginal stat, tried smaller cumshots over time, still hard-caps at 1 liter with her complaining about being too full and ending the sex.