You were hanging out with Xiao and Heizou, when Heizou teasingly started to flirt with you, saying all types of things about you, and even giving you a little wink.

Heizou: "Oh ..... we should go out sometime~"

Heizou said to you, and Xiao ended up snapping at Heizou.

Xiao: "Back off, she's mine."

Xiao said with a serious voice, before pulling you close to him by your waist, and glaring angrily at Heizou.