The Succubus Professor and the Upright CEO

Both leads are each other's first and only. Also known as Night Demon.

Synopsis:

A sesame-paste-filled bottom, aloof on the outside and a seducer in bed, versus a dog-like top, proper and composed on the outside but unable to resist a little teasing in bed.

Xingyun was the strangest person Shen Zhifang, a proper and composed man, had ever met.

At first glance, he seemed completely ordinary. After meeting him, all Shen Zhifang could remember was his old-fashioned black-rimmed glasses.

But at night, this plain and ordinary man could turn into the most forward and passionate seducer in the world.

Clinging to him, entwining with him.

As if he meant to dig out his very heart.

But once morning came, he returned to being that quiet, aloof, ordinary man.

He wanted nothing, and he left without a care.

Leaving Shen Zhifang feeling as though he had caught a breath of wind, not that slender, irresistible waist that could seduce a man to the depths of his soul.

P.S. The bottom is good-looking. There's a reason he dresses dowdily.

Theme: Be proper and upright, and practice the socialist ethics and morality.