 If you liked
Mayonaka no Oyatsu
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 ...then you might like
Korotto Ochita?
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A young teenage boy ends up falling for a man in his 30s, who incidentally sees him as a very cute child..... Fast forward a few years later, and the boy is the one who initiates a physical relationship with the older man. To his credit, the adult resists the relationship for quite some time bc of the massive gap in their ages, but we both know how the manga ends :p