https://www.mangago.zone/recommend-manga/sensei_wa_butchozura_shite_yatte_kuru/ im not sure if this is what you were talking about but this one also has an extra chapter about the children all grown up. specifically, vol.02 chapter 5 ((:
Mmm not quite cause if my memory serves me right the once child fell in love with his dad's lover and grew up on those feeling and in school meets someone who has feelings for him but that person finds out that he likes his dad's lover but I'm pretty sure they end up together in the end ┑( ̄へ ̄)┍ but thanks for showing me that one! I read from beginning to end and it was a great story
ヾ(☆▽☆)
https://www.mangago.zone/read-manga/koishite_daddy/tr/145990/page/1/ then it was this ^^ the main story and this is the kids' story https://www.mangago.zone/read-manga/love_kids/ <33
I thought there was a side story about taiga all grown up and finding a lover in high school? Maybe I'm thinking about something else but I think that's a cute idea! Cause his father and kiri would support him and I would find that so adorable(≧∀≦)