Nothing wrong with a cute girlfriend acting a little spoiled. I mean, the way she was pouting when he pretended like he wasn't going to oblige her when she wanted sex, that was just so adorable.
But in reality, who could turn down a request like that?
Great ending though. Whether she's being selfish or not, she's just so adorable. Our protagonist certainly is a lucky guy, but I think he knows and appreciates that fact.