So she's going to just take his money as he treats her like a novelty to be bought and she sees him as a dumbass who throws money around which she's going to spend on her girlfriend
As scummy as makino is being, he is kinda worse than her, being so naive and conceited... This could turn out as a good learning experience for him and a massive rollercoaster for makino as she both gets to spoil her girl and then having to face misunderstandings, assumptions and her mom