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Uke has been wronged in the past, old boyfriend reappears to try to set things right.
Uke summons demon (seme) after being "attacked." Some fluffy stuff, but mostly plot and character development rather than romantic stuff.
Haven't read yet, sequel/spin-off to Konya mo Nemurenai (http://www.mangago.me/recommend-manga/konya_mo_nemurenai/).
Uke is human, seme is a vampire noble. Seme views humans as nothing more than food, but uke honestly falls in love with seemingly uncaring seme.
12-ji Kara Hajimaru