chapters 1-5:
it's about an incubus who won't have seggz with anyone unless it's with the person he loves, and incubuses need bodily fluids to prevent themselves from disappearing. if they don't drink enough their form will start to look like of a child's, that's why this certain incubus looks so small because he won't have seggz with just anyone (~￣³￣)~
Tsukaretemasen Tsukaretemasu!