By BL standards this is a warm and fluffy romance with some smut, the last two chapters are given over to the main characters from the prequel/spinoff.
I really like the uke he seems to be aro/ace although this isn't confirmed in the text. He doesn't come across as having any close attachment to the seme.
The seme is mostly a good one but to me he only sees the uke as a sexual outlet and while he does have some attachment to him, I'm not entirely convinced that he considers what the uke gets out of their arrangement.