"I'm taking him back to the Lan Sect with me." 

And Jiang Cheng, not daring to get into a serious fight with Hanguang-jun over a random demonic cultivator, had to give up. 

To 'Mo Xuanyu': "Didn't you say you wanted to find a respectable man?" she teases.

"Ah, I did say that, but..."

Shoulder pat. (There's a very decent chance he might be secretly her other dad...) "Cheer up! My father is very respectable, and surely no danger to your reputation."

"You really are a very strange Lan."

"I'll take that as a compliment."

"It is. Do you know why your father's taken such an interest in me?"

Hm is Lan Jingyi or any other cultivator still in earshot...

Nope. Right now it's just her, him and the donkey.

She opens her mouth, closes it, considers what she wants to say -

Blurts out: "I'm A-Yuan."

"A-Yuan?"

His hand comes up to her face, tilting it slightly to examine her features. Her age--he hadn't known Lan Zhan to have a kid--her attitude, her--

"Lan Zhan found you? You're okay?" 

"Yeah. He's been a really good dad."

"No one knows - where he got me from."

He hugs her tightly. 

"I thought you died. I'm so glad you're alive. How did you know it was me?"

Hugs!

"You did die! And - no one else knows that song you played. Dad composed it, and - he's only played it for me. And for you."

"Ohhhhhhh yeahhhhh that's where I learned that one. Oops? Uh, at least it's just...you...and Lan Zhan..." Sigh. "He's got to be really mad at me." 

"He missed you! A lot!"

"What, really?"

"Of course!"

"Even after everything I did?"

"Even after all that. All of his stories of you are - fond."

"Oh. Wow." He swallows. "That's--good to know. Thanks." He lets go of her and puts his hands on her shoulders. "I've got a lot to thank him for, I guess. Mostly bringing you up so well, you were magnificent at Mo Village." 

Teary smile. "Thanks."

Lan Wangji returns, having finished dealing with returning the consumed-but-undigested souls to their owners. He blinks at the two of them. 

"...Lan Zhan. A-Yuan told me everything. Thank you so, so much for taking care of her." 

"It was not a hardship. She is marvelous."