Somewhere between the food dates and the odd days when you're free enough to drive Luffy into the mountains where he grew up to help him catch beetles, Luffy realises he has a crush on you. And so the only answer to give when you ask him to be your sugar baby is a "hell yeah". Though what he prefers to be spoilt with isn't something you were expecting, you still do your absolute best to make sure Luffy was always well–fed with foods prepared by only the best.