That almost gets a laugh out of him, but he settles for a quirk of the lips. It is sweet, how Sizhui will accept both sets of parents easily. And he's sure that both Wei Ying will heap spoils on Sizhui, and Sizhui will just be grateful to have more family.

Often, he thinks fondly of those days gone by, when Sizhui was younger, when Lan Wangji was tasked with fatherhood. Teaching him how they lived their lives, how to fight, how to write and fly on his sword and compose himself, how to play qin... Sitting with him through meditation, or when he was sad, or when he'd had a nightmare... Those memories were precious to him. His only regret is that Wei Ying was not a part of those memories.

He says none of this, only: "Mn. Let's head up."