It's unfamiliar but it's a good unfamiliar, Xichen unable to hold himself still, hips jerking forward into Guangyao's mouth, one hand ending up in Guangyao's hair as he's panting quietly, his breathing harsh.

"A-Yao, I..." He shudders, the pleasure overwhelming until he's coming into Guangyao's mouth, the teasing and now that mouth and tongue more than enough to drive him over that edge.