It was a manga abt 2 guys who met in highschool years have passed since then and one of them got a major growth spurt and grew out of his cutesy look which leads to him wanting to try topping for the first time
https://www.mangago.zone/read-manga/neko_x_neko/
It was a manga abt 2 guys who met in highschool years have passed since then and one of them got a major growth spurt and grew out of his cutesy look which leads to him wanting to try topping for the first time