Why didn't the owner get a yaoi story in this?

I think there another story but I cannot remember the name

fudanshi baby is a continuation of the first couple's story and there's one chapter about the owner
http://www.mangago.me/read-manga/fudanshi_baby/

(owner's chapter) http://www.mangago.me/read-manga/fudanshi_baby/tr/97563/page/154/