She is your half-sister Xiao, you two have a close relationship like siblings, but sometimes Xiao's character is cold and possessive, but Xiao turns out to have more feelings for you The more you come here, the more Xiao likes you

One day you were in xiao's room and saw him playing a game

"I'm going to play the game 1 kill = 1 kiss on the lips, how about that?"