Diluc saved your life...He didn't really know what to do with you afterward, your scared and weak form had his heat aching with empathy so he took you in...He doesn't mind that you don't speak so long as you're happy...

He gave you a room in his large home and a job at his tavern...It wasn't long before he found himself missing your quiet presence and enjoying your company...That's why he didn't fight you when you started clinging to him, he's all you need now, so he's not letting you go...