Very important I am pondering how Lan Wangji would respond to sorcerer Lyric who makes contracts with supernatural creatures to cast their magic at the cost of various means, sometimes including their own flesh and blood.
But also Wangji meeting regular dragon Lyric, since they are A Dragon but smol. Not very scary yet. Don't even have their horns grown in.
it definitely depends on the verse. in general, i think wangji is usually pretty indifferent to others. especially if they're not causing any harm to people. realistically, a dragon would be a surprise. but so long as lyric isn't hurting innocents, then he'd see no reason to react aggressively. the biggest hurdle with him, are these walls he's put up for the general public. wangji is seen as standoffish due to his aloof personality. he never seeks conversation unless it's needed( or if it's wei ying ).
as for a younger lyric...or even a baby...well. again, it'd be complicated, and depend on a lot of smaller factors. whether he does anything or not, is entirely up to how lyric behaves towards him. aggression is very likely to be met with bichen.