(What if Lan Wangji and Wei Wuxian met when they were both younger and it actually changed Wei Wuxian's life?Wei Wuxian's dog fear is canon,by the way.)

Wei Wuxian was abandoned by his parents at 5 years old,he had to survive without them.He wasn't found by Jiang Fengmian yet.

It's after Wei Wuxian first saw Lan Wangji.Wei Wuxian was outside in a secluded area and he was met with Lan Wangji.They just stared at each other, before Lan Wangji left.

After 10 days.

They are both 9.

(You're Wei Wuxian.)