hmm... It wasn't by force, don't forget that he was under the influence of the heat and wasn't in his right mind, you can clearly see the moment he snaps back to reality. As a matter of fact, he took the contraceptive before sex even though he wants a child with Haga. It was more of a roleplay.
Well you can see it that way but there was still 10% chance of him getting pregnant and he made it clear that he didn't want having kids yet because they had only dated for 3 months and it was too soon it didn't really seem like a roleplay it felt too real
They talked about taking the morning after pill afterward so he's not gonna get pregnant yet.
Umm I didn't like the ending i was not into him trying to forcibly impregnating him while he was in a vulnerable position I would rather have a story about his friend she was sooo hot