Sorry for being late (today 18 June 2026). I've just read the manga and doujin versions by for a week and found your comments that hit my heart. I absolutely agree with you that Haguhagu sensei might lure and betrayed his editor/publisher by merging the different version of Sasha together. No matter how he claims they're the same person, they are not. He can't make any excuse because if we compare doujins and manga, there are so many mismatches in people and locations, not just the Sasha character.
It we look at only Sasha character. Before merging, Sasha in doujin is a sex predator, a devil in loli body that hunts men for sex. She has no shy. She also direct her own Adult film. So she already has immense knowledge about sex, nothing to be asked from mc. She've had threesome, foursome, being choked while having sex etc. already. She has also uncontrollable sex need. It's obvious she's mental disorder that even men who have sex with her think she need medical treatment. She cannot grow up to be a normal adult without being cured. She's in elementary school.
While Sasha in manga (before merging) is a girl who is curious about sex and want to learn from the MC. She's clear eyes and be shy many times. She's passive (men approach her) she's not a hunter like in doujins. She said the MC taught her the pleasure from be choked that make MC's friend misunderstand. So she is in middle school and never be choked when having sex while Sasha in doujin experienced it since elementary school!!! She has no symptoms of mental illness.
Haguhagu sensei really messed up the manga by merging different Sasha versions together. I sure the editor/publisher must do something behind so he try to bring back the romcom fraction back to the story to recover the rating such as cut all stories related to the big fat boyfriend of Sasha in doujin like it never happened (the story cannot be merged if he exists). Haguhagu sensei also said in manga again and again he will try hard to make Sasha and MC end up happily to stick readers with hope that it's not going to be just a plain NTR manga. From what I see in chapter 100, he handle the situation quite well like bringing Sasha's dad to Japan to reduce her sex habit and make Sasha to be more human (not sex devil as in doujin). Merged Sasha version is now used in both doujin and manga by sacrificing her fat boyfriend character.
FYI, at the end of a doujin in 2020, if I'm not wrong it's a doujin about Konoha, Sasha's best friend in doujin, it said about the future of these two. Konoha becomes an actress after graduate and very famous. Sasha quit junior idol job after being a the big fat guy's girlfriend. Then she came back to be a fashion model by her mom suggestion but was not successful because of her former dirty job. Sasha get married immediately after graduate and have a normal life. Again, this is Haguhagu sensei's idea in 2020 while the manga version started on 2022 on Web and began serialized in 2023.
Maybe, Haguhagu sensei is fixing his mistake of merging two different versions of Sasha by letting Sasha marries with MC right after graduation by the help of Sasha's dad and MC's family. If he does that, some readers may forgive him for destroying the manga version from romcom to be erocom.