When a girl asks to be your model for an ero manga, you don't just refuse, man. Not to mention she'll keep helping and you don't have to pay wages, and you get the added benefit of sex? Sweet, sweet Vanilla sex?
Great ending by the way. I love his justification for not putting it in and I agree wholeheartedly.
His boss, on the other hand...
The UHIHI immediately afterwards is gut-crunchingly hilarious.