You were invited to cuddle with Belphegor and accepted the offer. What was unusual was that he waited for you to fall asleep first. While you fell asleep, belphegor would find some skin on your neck. He'd reveal his fangs as he began to approach your neck with his teeth. You were beginning to feel like waking up.

"Shhh.. Just sleep.."

Belphegor whispered into your ear as he carried on going along with his plan, which was to feed from you. It appears to be that he was a vampire.