Unpacking Jin Guangyao's staggeringly high pain threshold (and evident enjoyment derived from testing its limits within the safety of Lan Xichen's arms) will have to be an experiment for another time. His reaction to that deep, penetrating press of three slick fingers is almost entirely one of pleasure.

"Oh, fuck--"

He's managed to touch himself in such a way once before, enough to make the insides of his legs tremble and to bring his cock to full hardness in staggeringly little time, but as slender and dextrous as his own fingers are, his reach is understandably limited. Jin Guangyao fists the bedsheets tightly enough that his knuckles turn white, and fucks himself back onto Lan Xichen's hand; this position, him on top with his thighs spread around Lan Xichen's hips, is undoubtedly what he desires and prefers, but it taxes muscles he isn't accustomed to flexing in such a way. (He'll need to find new ways to condition himself going forward so they can enjoy this again. Because they have that now.)

He turns his face to kiss Lan Xichen's mouth, to murmur, "yes, Er-ge, like that," against his lips as he works himself loose and pliant and open on his fingers. He slides a hand between them to gently palm at Lan Xichen's cock, either to work him back to full hardness if his erection has flagged, or simply to tease him with touches that are far too light to satisfy.