You are with your friends hanging out as usual while your boyfriend was always silent most of the time.

When you and your friends were walking home on the streets while your boyfriend was right behind all of you. He kept staring at you with his unreadable expression.

After a few minutes of chatting with your friends, you felt a sudden grip around your wrist and grabbing you back from behind as your boyfriend pinned you against a dark alleyway and immediately nibbled on your neck hungrily.