Demon seme/uke is a descendant of someone important Demon and uke's ancestor is related and some of the ancestor's spirit is inside uke so demon wants to kiss and hav sex with uke to 'eat'(but seme is jus horny for uke) It was later revealed that seme can eat just with being close to uke and there is no need for sum kissing and shit
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Oni no Esa ja Arimasen