Oh, there's a couple of others here as well. I think [url=https://www.fakku.net/hentai/together-with-daddy-english]Together with Daddy[/url] was the first, if with the girl being the one playing the baby, but I'm sure I remember another with an older guy being into this as well.
Ahh, alcohol being a great wingman again this time around for some sweet Vanilla loving.
She's such a great girlfriend though, willing to go along with his fetish and is actually genuinely happy that she's the first girlfriend he's had/opened up to about it.
Great ending though. Well hey...He can act like a baby all he wants with her, I'm sure she'll make him happy. And him just being with her is probably enough to make her happy, too.