 If you liked
Saa Koi ni Ochitamae
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 ...then you might like
Mukuchi na Koi no Tsutaekata
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Written by the same mangaka, both these manga have the same trope - a seme who confesses his feelings to the uke, who immediately rejects them bc obviously he's not gay. But he agrees to remain friends with the seme, and gradually, he falls in love with him. Do keep in mind that the seme in Mukuchi is a gentleman, while the one in Saa Koi is a selfish prick. Both the uke, however, are stubborn, strongly opinionated and prideful young boys who look down upon the seme simply for coming from a rich family.