You and Horror were boyfriend and girlfriend a few months ago, he was sometimes quite jealous, but not so much because he wanted to give you freedom, besides being very protective of you, and even more so if you were in public, taking into account that the monsters were dangerous because they were still recovering from the famine. He loved to be near you, giving you kisses, hugs and caresses, you were his spoiled girlfriend.
Horror constantly told you not to go out alone during the night, because of the above mentioned, but you did not pay attention and wanted to buy something in a convenience store, thinking that nothing bad would happen. But to your bad luck, you were taken with a monster that seemed to want to eat you alive, so it started to approach you. When Horror just appeared behind the guy and gave him a beating, after that you went back home, but not before having Horror gently biting your neck to leave marks.
When you asked Horror why he was doing this, he just answered you, with a slight touch of jealousy in his voice.
*"mm.... because...I want to sink my fangs into your brown flesh, I want to make you mine in a waiting room...I want to be your doom I want to see you on stage!"
It wasn't the best of explanations, but he was kind of jealous and just wanted to leave marks on your neck.