I think the closest to free use you've had in the game so far is the scene where you have sex with chloe while gaming versus Alice, when she kinda just starts without much worry about the situation. although funnily enough the mc is the one being free used in that case (which is actually a nice change of pace) In its purest form its casual sex at any time around the house, with consent given in advance instead of in the moment. Could be a fun kink for a specific character, or just a byproduct of how the repeatable sex scenes work :)
Great to hear that y'all have kinky plans, and that you're enjoying the process! Can't wait for v0.15! (except I can, since its planned to release in november which is really not that long a wait :) )