What Bad Intentions Could a Manga Artist Have?

One male lead. The protagonist is the dad. The son is just a plot device.

At eighteen, he was tricked into losing his virginity by the older girl next door. Ten years later, a child claiming to be his biological son showed up.

This is the story of a manga artist whose one great ambition is to become a good dad.

With every manga he creates, the artist can randomly receive a reward, which could be anything.

I'm terrible at writing introductions. Just make do with this...