He bows to Wei Wuxian, sword in hand, sleeves falling properly. Wei Wuxian bows in return, and the sect leaders begin the opening courtesies, and for all of ten minutes Lan Wangji is under the impression that he is betrothed to a boy who is perfectly normal and acceptable apart from an unfortunate tendency to fidget with his clothes.
That impression does not last.
Source: seldom all they seem, by Fahye – 陈情令 | The Untamed (TV) [Archive of Our Own]
I adore betrothal AUs, and this one is just wonderful – gently funny and describing a kinder version of events that still remains recognisable.