I know I'm beating a dead horse, but it really feels like we peaked at volume 8, when Souichi actually initiated, kissed Morinaga out of his own free will and basically made it clear that he was into their sexy times (in his own tsuntsun way). But now it's kinda back to square 1.5, isn't it? At least that's how it feels like (づ ̄ ³ ̄)づ
Slight spoiler
From future chapters it looks like the doctor is male. Could it be that Shizuma knows this already, hence he doesn't realize how Minato considers the doctor a "threat"? To Minato, every pretty female around Shizuma is a huge problem, and if he thinks the doctor is a woman (which he does) of course he has a different take on the situation than Shizuma does. Not excusing Shizuma here, the whole "oh he's so jealous when he's cute" is honestly pretty random and kinda inappropriate.
Overall, I wish the doctor didn't play such a huge role, they just seem weirdly involved for no good reason outside of drama.
Gosh, I miss Shouhei and Itsuki so much, but I'm also kinda happy they have no drama. I'd probably die for a purely wholesome slice-of-life sequel with them though ╮( ̄▽ ̄)╭
Maybe Shouhei can introduce Itsuki to his friends (they seem cool) or some more shenanigans with the parents, who seem to love Itsuki!
Raws, for anyone who wants them
https://nhentai.net/g/461122/
The way I gasped in shock when I read the link that took me off guard
I was surprised myself, simply typed the manga name into Google and this was one of the first results - not complaining, tho ╮( ̄▽ ̄)╭