Barry's fingers spread wide and Derek's eyes roll back in his head as he moans, chest heaving as he pants. The pleasure is almost entirely new. He's never even really touched himself like this and it's Barry, only Barry, who can coax this sort of mindless reaction out of him.

It takes Derek a moment to figure out what Barry means, but once he does his cheeks flush pink and he shivers from head to toe, wriggling eagerly against Barry's fingers.

"I want you to fuck me," Derek breathes out, clenching around Barry's fingers and letting out a whine as he twists around to look at him with an open, needy expression. "I want to feel your cock inside of me. I want you to be the first one, Barry. The only one."