On the willows there, we hung up our lyres

And so Lan Wangji ushers Galahad inside, keeping a hand flat and steady between his shoulder blades until they're indoors. He never touched any of his Lan junior disciples like this; it would never have occurred to him. When Sizhui grew old enough, he intentionally stopped touching him with overt affection where anyone could see.

By the time they step inside, he's made a small decision, and he brings Galahad up the stairs with him, to the room he shares with Wei Ying.