Derek feels overstimulated in the best possible way, pleasure cresting outward until all he can see are stars. And then Barry vibrates even more and Derek cries out into the night sky, cock twitching valiantly against his belly as Barry stiffens inside of him. There are tears at the corners of his eyes when he finally comes back down to earth, and his chest is heaving with each breath. His legs feel like jelly as they fall helplessly from Barry's hips, and he swallows hard as he keeps an arm wrapped around him as best he can.

It feels like he was shaken apart into a million little pieces and then put back together even better than he was before, and when he opens his mouth he finds that there are no words to even convey how he's feeling. Barry is trembling on top of him and Derek holds him close, lips pressed to his temple.

"I love you," he breathes out, and that about sums it up.