Manga about two guys who were sex friends in HS. Seme thought that the uke disliked having sex with him. They separated after graduation. Few years later the seme finds the uke waiting in front of his house. Turns out that the uke works near where the seme lives and actually loves the seme.
Is the spin off of Oko sama star, the story about the friends of MC
I felt like there's an entire chapter missing. The jump from 39 to 40 was too awkward. I they didn't even explain why the sex was necessary
But Caius did explain why sex is necessary...
In order for the summoned to stay in the other world he needs to form a contract, wich is made by ingesting blood or semen of the person who made the spell. Thats why Caius had to come inside Koichi
in the previous chapters/episodes that they had sex Caius never cum inside Kouichi only that time when he Caius was about to die, he cum inside Kouichi as a form of contract coz this time Kouichi is 100% sure that he'll stay with Caius.