On Steam, I just found a combination Dungeon Crawler / Dating Sim. While I wish I could say that's as weird as it gets, the premise is that you have to date and romance your weapons in order to level them up.
.
I kid you not, the game is called "Boyfriend Dungeon". Let me just go ahead and give you the link because I'm sure just "Googling that" will not go well....
https://store.steampowered.com/app/674930/Boyfriend_Dungeon/