I loved "The Lion Never Refuses" for a whole lot of reasons, not the least of which is the acceptance for their relationship by the one guy's dad. (I don't remember names.)
For this one... I didn't *mind* the nurse/student, but the dad/secretary annoys the shit out of me. I get "tsundere" (though they get old after a while) but when they never get out of that, it makes me nuts and the dad is just an ASS. Ugh.
I totally get that though. Some of my first, and therefore favorite, yaoi is by Fujisaki Kou sensei. Objectively speaking, her stories are compelling, but her art style makes all her characters interchangeable. Not to mention that her perspective (head vs body sizes) is often kattywampus (way off). Yet none of that would ever change the warm, fuzzy feeling I get when I read her works. They hold a special place, just as you said.
Some I just adore and some I can do without. This... this is definitely the latter. Perhaps it was an earlier attempt, their first maybe. The plot is dull, the characters are not likeable, the development was lacking and the conflicts are cliché and contrived. Then sensei writes something like "The Lion Never Refuses" and I can't help but wonder if this is really the same mangaka. The stories are so vastly different in tone and quality. The Lion Never Refuses has a smooth, sweet plot with adorably likable characters and a very positive LGBT tone. This manga is the exact opposite. I'll stick with sensei's later and better works.