Barry feels the most tightly coiled parts of himself relax at the surety in Derek's voice, and he snuggles closer, his thoughts sweet even as his fingers begin to breach the deepest part of Derek. "Mine," he echoes, sucking in a breath as his fingers dip inside. It isn't the first time, but it's the first time with this intent, and Barry can't help feeling reverent as that tight heat grips the tips of his fingers.

"I love you," he murmurs. "I never thought I'd have this. I'm so glad it's with you," he says, starting a low buzz to help Derek's muscles relax. Barry hums, thinking again of that blissful moment when he'll sink inside of him. "Tell me when you want more."