Game looks super good, I bought the game for a bit extra to help support it. I have some suggestions for the cum system if you'll have them.
Two parts one is gameplay and the second is graphics. I like cum working as a second health bar, and a way to dissuade people from having sex before two-shotting every enemy is a good idea. I think status effects based on how full the player is would make it a bit more of a fun risk. Either in making some attack rolls harder to land, or making hits that land on the player have a larger crit chance. Could also add more risk/reward by making rings that give damage buffs, or tome/wand charge faster the fuller the player is. Lingering statuses like being covered in cum after a rendezvous could be fun as well, with a random chance to drop a swung weapon on every attack. As it's pretty hard to keep a good grip when you're doused in fluids. Treat it like water staying on after you get out for a bit.
Now for graphics, I love this model and I think the cum bar filling up also being displayed on the character model would be cool. It would also make a nice visual indicator for how careful the player has to be about initiating more sex.