Junior Brother, Don’t Be Afraid. Your Senior Sister Will Take You Home

The Little Bird and Little Dragon series. There will be more later, so everyone is welcome to read them, and submissions are welcome too:

As a child: Wukong secretly picks peaches for his senior sister, who mischievously knocked over Patriarch Bodhi's teacup by accident.

A little older: His senior sister watches Wukong perform the spells he learned from their master again, and can't help applauding and praising him.

Later: His senior sister hears that their master has driven Wukong away. Though she doesn't understand why, she believes their master would never hurt him. She often turns into a little bird and watches her junior brother running around from a tree branch.

During the Bone Demons' three attacks: His senior sister watches that monk misunderstand her junior brother again and again. Her junior brother manages to hold back the urge to rush over and slap him twice (Respect your elders and cherish the young. Very good, very good). When she sees her junior brother driven away, she wants to step out, but receives a reminder from their master, so she has no choice but to stay hidden.

During the Fake and Real Monkey King episode: Seeing the Six-Eared Macaque's staff about to strike her junior brother's head, she can't hold back. She goes out and takes Wukong's hand, blurting out, “Master wants you to come home. Will you come back?” This is the second time her senior sister has seen tears in the corners of Wukong's eyes. The first was when he was driven out of Fangcun Mountain...

His senior sister doesn't know about the journey to the West or fate. She only knows that the junior brother who gives her peaches isn't a bad person... Since their master hasn't come looking for her, that proves she did the right thing.