That's not the issue, the reason he doesn't want to come inside is because when he comes inside he sucks his life force out of him, and he doesn't want to do that anymore because anymore and he will literally die...
Haha that’s it!!! I’m so glad you got it, I was so worried because it’s implied but never reaaaaally outright said. Yeah, so no matter what Incubus is constantly eating Yahiro’s life force during sex (which is why he left in chapter 3, cause he didn’t want to do it AT ALL, but then Yahiro wanted it so Incubus, who is struggling with his affections, is like ‘fuck it who cares, if my food is begging to be eaten and I’m hungry, I’ll eat it’)
But cumming inside for whatever demon-y reason (again it’s never really said why) takes a RIDICULOUS amount of life force out of the human, so while Incubus is resigned to eating Yahiro, he’s trying to extend his life by not cumming inside (cause he does care)
Exactly, I actually hope he dies and becomes a demon too, the they can have sex all they want, I hope this story doesn't end badly
With the beast not allowing himself to cum inside, MC can definitely get pregnant