[he doesn't make it any easier for him to stay still! his hands run up and down his legs, pausing only to brace his hips to get a better angle or to fondle the curve of his ass. when he sees how Lan Wangji responds he only get more into it, letting his tangle of hair tickle at his thighs as he bobs his head at a steady pace, moaning every time he feels it hit the back of his throat or twitch with interest. he keeps his eyes on Lan Wangji, trying to spot what makes him feel good, what drives him nuts, what will wreck him and make him fall apart in his arms]