I just picked this up today and glanced over the comments.
Reiji does not come off to me as manipulative, he has the best luck, really. Sure, he saw Ao many times before and fell for his beauty and kindness but no one made Ao bring reiji home and feed him nor did anyone force Ao to have Reiji over that night. Reiji was pushy to the extent of claiming Ao's bed rather than the futon set out for him but Ao could have slept in the futon too---he chose to get in bed with this guy. I think the first sexual encounter was dubious consent not rape but only because reiji got his dick in position faster than The Flash and Ao didn't have the time to process a yes or no, in the end he asked for more pleasure so...
I'm impressed that reiji was responsible enough to get Ao to see a doctor asap but seriously....Ao could have 1. Not had any contact with any alpha's and waited to see if his percentage went back down to 10/90, or 2. Started dating alpha's beside reiji going forward...I get that the doctor was telling him hey, you have a muterus ( male uterus, my words) live like the omega you are and be physically and emotionally healthy but once he said he didn't want that the doctor should not have advised staying near reiji...of course the alpha pheromones were gonna keep changing his body with or without sex.
However, it was not cool for Ao's job to dismiss him once he predictably went full omega. It was not cool for Reiji to brush off how upended Ao's life became just bc he had sex with a dominant alpha. It was obvious that Ao wanted to live independently. It didn't appear to me that Ao was sad or lonely bc he didn't have a partner or anything so it was presumptuous of reiji to offer to take responsibility in the way he did. It was a very alpha male mindset but it was also disrespectful of Ao's feelings and self-serving. Ao is pretty screwed now. Not just bc he needs a new job but for the first time he thought he might want kids someday, which mean he will need to hook up with someone who can make that happen and that will likely have to be an alpha. Will it be hard for him to find the alpha he needs and still have the freedom and independence he wants? Why hasn't he talked to his twin brother about all this sh!t yet?!
Boku no Omega yo Samenaide