Barry keeps talking - he knows because he feels his mouth moving, feels his lungs burn as his body and voice fight for the oxygen, but he has no idea what he says. His entire world is Derek, the tight grip of him, the incredible sight of him, the bright red of his eyes when he leans down and opens them, punching another groan from Barry's throat.

"Derek, I'm gonna - " Barry breathes, trusting that Derek knows the difference by now between I'm going to come and I'm going to vibrate, because he can't hold on another second. Gripping Derek's hips tighter, Barry pulls him down and lets go, vibrating hard against that sweet spot inside of him.