 If you liked
Hana to Akuma
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 ...then you might like
Boukyaku no Shirushi to Hime
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BnStH reminded me of HtA a lot because of the age difference and innocence of the female character as well as her cheerful personality.
Both are also of the same genre as in romance and fantasy mangas.
However, the circumstances where the two MCs meet is different as Lylia came with the purpose to marry while Hana was taken in as a child and raised by Vivi himself.