
So this one is sort of like they were not best friends, but they went to the same high school. And you know like how they usually put Japanese high school kids always fighting with each other's gangs or whatever. Yeah, these 2 used to fight with each other, but like some shi happened and one of them turned into a girl and they started banging, but it's super funny and it's lovey dovey and stuff like that. It's all good stuff. (Nyotaika Yankee Gakuen ☆ Ore no Hajimete, Nerawaretemasu.) That's the name.
I read it on a different website.But it's also on here I checked..(ToT) and that was just a short story of what? I can recall. Hopefully you enjoy it as much as I did.

https://www.mangago.zone/read-manga/my_childhood_friend_can_t_be_this_big/
https://www.mangago.zone/read-manga/childhood_friend_complex_eunhi/
are the only ones i can think of at the moment, hope it helps
I really really want a best friends (preferable bantering), + GUY AND GIRL webtoon/manwha smut! Like best friends to lovers and PLEASE make sure theres a lot of playful banter/fight amongst the both of them! I rlly think its a good troupe! Pls keep in mind i want a straight one. I don't usually read straight ones so please give it your best shot!!!