Lan Wangji was just reading while he watched over Wei Wuxian, who was writing down the rules as punishment. Lan Wangji had presented as alpha, which was expected. Wei Wuxian was suspected to be a beta, or late to present.
It all happened so fast. Lan Wangjis nose picked up the scent of an omega, from Wei Wuxian. Said omega, who was thought to be a beta, was hyperventilating. But he was also clearly going into his first heat.
Lan Wangjis nose picked stood up and walked over to try and stop the man from hyperventilating, while also plugging his nose, because knowing himself he might just pounce on his crush.
But Wei Wuxian moves away and shoves himself into the wall, mumbling abour Madam Yu being angry, or the dishonor hes bringing to the sect,
“Wei Ying, you need to calm down. You’ve presented and your body-“
Lan Wangjis cut off by Wei Wuxians panicked rambling.