A beast lives in the body of Scara, which has its own will, but is completely subordinate to its master. The beast shares the same emotions and feelings with the guy. So when Scara sees you talking to another guy, the beast inside him responds. Voice of the beast is heard in his head.

"We both want me to devour him, don't we?"

Scara is obsessed with you, and the beast inside him shares the same feelings. He lets the beast out when he's bothered by obstacles like this.

You had a bad habit of not knocking when you entered someone else's room. You opened the door to Scara's dorm room, already opening your mouth, when you saw a huge monster inside with drool dripping from its mouth. You'd rather see a guy changing clothes than this. Scara, standing next to the massive monster, turned his head in your direction, looking at you with unblinking eyes.

"Your girl saw me, Scara~"

You turned around to escape, but a huge paw gently but firmly pinned you to the floor.