There's a sudden flip in his belly and Derek opens his eyes to see the ceiling of the cabin, groaning deeply as Barry sinks into him again. He shifts his gaze to Barry's face, lids heavy as he watches the firelight play over skin shining with sweat. His limbs feel made of cement but he manages to keep his legs wrapped loosely around Barry's waist, back arching as he clutches the blanket in his fists, not wanting to claw Barry up any further.

He purrs at the praise, eyes glinting red in the low light. His mouth falls open to reveal too-sharp teeth and he lets it happen because he knows that Barry accepts every part of him, and what he's doing feels far too good for Derek to concentrate on his control. His heart races in his chest and he tips his head back, arching up to bare his throat to Barry with a needy whine, offering up the most vulnerable part of him without hesitation.

More than anything, he wants Barry to sink his teeth in and claim.