I think the only potion you need is the purple one in the round flask. put it on the hotbar and choose it so she's holding it, then hold down aim and then hold down throw. If you hit a bug it will have hearts coming out of it and will approach you when you go near and then if you let it cum inside her she seems to get pregnant frequently. she'll have a line of dialogue after sex about feeling strange or something like that. You don't need the fertility potionHow do you use potions? I tried using it in my inventory, in the hot bar, in every single place I could put it with every single button on my mouse and keyboard and for some reason I was unable to use them at all. It's a nice proof of concept but without potions I can't try out pregnancy which was the whole reason I tried this out
Also I think this game needs an fps limiter because it runs great but makes my fans run at full speed for every second I have it open lol