Hello, I'm looking for a yaoi in which the seme is young and small at the beginning (maybe smaller than the uke), in love with the uke, and grows after. The uke, who didn't consider the seme as a man, is surprised and begins to have feeling for him.

It can be the reverse, the uke is at first young and childish, then begins to grow and get noticed by the older seme. 🙂

You could try, if you didn't already:
Mayonaka no Oyatsu
2-dome no Koi no Hajimari wa chap 4-5
Ai no Kotoba o Uragaeshi

Mori no Koe second story

Kyuusu wa Cheese no Yume o Miru

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Thank you !! If you have other ideas, don't hesitate 😉

Brother and brother 2 by ougi yuzuha. The seme was smaller than the uke, but he was the first to fall in love

Kawaii Akuma (linked here)

Puchi Puri, maybe. They were already in a relationship when the seme is small, though. The seme is in elmentary school while the uke is in high school.

Thanks!! ^_^