Even though this story is somewhat fully and happy, the idea of Kotaro being a mortal, which means he'll grow old and die eventually, makes it even more painful to know how much the incubus truly sacrificed to be with him - not only his education and rank, but also the grief that has yet to come. (Yes, my main quality is to take fun out of everything, I'm sorry)
Woori better step up his game fr, I can't deal w this current seme.