[That gets him from biting his knuckle to outright clamping his hand over his own mouth to stifle the sharp and breathless noises coming out of it. His nails scrape lightly against Dan Heng's scalp and his hips take what little room they have to rock in his mouth, as the breathing and swallowing around his cock drags him that last bit over the edge and he spills into his throat with a smothered groan.]