Alright, I don't really remember the plot that well but here's what I got. So the manga has 2 couples. The first one is a demon seme with black hair and tribal tattoo things and a human uke that's a college student and has blonde hair I think. The uke is getting sexually assaulted and he begs for help. Somehow, this activates a seal that pulls a demon over to the human realm. This scares those guys away, so the uke is safe. When the demon asks the uke what wish he wants him to grant, the uke says that all he wanted was to be saved from those guys so the demon doesn't need to grant him his wish. Also, the demon looks like kinda like a kid in the human realm, so he's shorter than the uke. The demon stays with the uke he saved and they fall in love. The demon turns out to be some kind of nobility and has to go back to battle some other demon dude. They use seals for all the transporting between realms. And then there's another couple, a human seme that's the other human's friend, and a demon uke with long blonde hair and was the other demons fiance or something. The demon uke first comes over to kill the human uke for stealing his man and tries to drop him from a high distance, but then he finds the human and gets over it. If you can find it, I'll be forever grateful. <3

Konya mo Nemurenai?

Ermergerd, I'm crying so hard. I am eternally grateful. I love you so much! (๑♡3♡๑) Thank you so much!