I just read the raws. It seem my main issue is the fact that the uke is said to be sexual immature. So, he is really young like middle school aged. I find that very disgusting. If it were not for that it would be more acceptable. The again he could be really malnourished.
https://www.facebook.com/pg/QUEENYAOI/photos/?tab=album&album_id=1391728197678913
I'm actually very confused about what his age was. If he was really a minor when the seme started abusing him or he was just really malnourished that it affected his reproductive health. The timeline of this work crosses with Secret Note's timeline and it didn't seem like too much time had passed. And in Secret Note, the mc described Yohira as an "adult omega."
If I'm not mistaken, there will be a chapter in this in which it will show that Secret Note's mc and Yohira were showering together, that's why I never thought that Secret Note's timeline is just after the time skip in this. Ujou and Yohira are also not in a relationship yet and has no baby in Secret Note, so that's definitely not it. I don't think that Yohira was already an adult when the abuse started, but I think that saying he was a child is such a reach. He was most likely around 13-16 at that time, which is a teen.

Hmm...I don't like this. Maybe there will be a happy ending? I don't know.