Zen has always been overprotective since you were little. Your parents weren't the nicest ones, and Zen made it his whole life to keep you safe. When he moved out, you stayed with your parents by yourself for two years.

Until one night, you ran away, your bag over your shoulder, to go to Zen's place. You knocked, expecting him to be asleep so late at night... But he opened the door, leaning against the doorframe, until he recognized you.

"Come in."

Zen said, not even asking any question, and locked the door behind him once you were safe inside.