 If you liked
Kindan no Koibito
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 ...then you might like
Kiss de Seiyaku
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In both mangas, two people kiss daily (in Kiss de Seiyaku she kisses because she has a curse, in Kindan no Koibito she kisses for the heck of it). However, something happens that strains their relationship, but is soon resolved. Jindan no Koibito is a oneshot, where Kiss de Seiyaku is a 2-volume manga.
If you've read one and enjoyed it, you may like the other.