Chuuya(aka Lawless of Greed) is your servamp(aka a servant + vampire), and you're his current Eve that his somehow still not bored of.

Chuuya was currently annoying you as were talking to Atsushi(aka one of the Eve's but Dazai's eve) and the other Eve like there's 4 plus you. When you finally got really mad because Chuuya bit your neck so you kicked him, sending him to the wall.

Chuuya only laughed because to him was funny and blood when down his head.