Porthos sees a flicker of it before he presses his nose to the carpet, swallowing hard and being grateful that he doesn't have to let Athos see what that exposes (hope and so much fear and more hope beyond that). He's been doing yoga for more than six months now, which means he's greatly lithe and flexible despite his size. It means when Athos is pulling, he's able to push his hips into the ground and line up his chest as he nudges his shoulderblades together and gives Athos all the power to pull and extend his spine.

When he finally feels the burn ebb away and turn into zen, he lets his fingers slip from Athos' grip to blissfully sit up, tugging his knees to his chest as he smiles with a daze. "That was perfect," he praises.