"I thought I knew before you," Derek pants out, "but I had no idea. You changed everything."

Barry thrusts just a little harder and Derek gasps, arching into it and feeling his eyes go wide as Barry's cock brushes a spot that makes him nearly keen. It's a revelation, having Barry inside of him. It's so incredibly intimate and the romantic part of Derek loves that they're the only ones to have this part of each other.

"All I see is you," Derek says fondly, sliding his hand from Barry's cheek to the back of his neck, gripping firmly as he pulls him in for another kiss. He whimpers into Barry's mouth, eyes shut tight when he hits that spot again. "You're all I can feel. It's so good, Barry. Made for each other, right? We had to be."

He's practically babbling, voice coming out in a breathy rasp as he rolls his hips to meet Barry's thrusts. It's a whole new set of motions, but Barry is right there guiding him and it's so easy to fall into them. It feels so good that for a second Derek wonders why he waited so long to try it. But the answer is obvious. Derek was waiting for him.