Flopping down next to him, it didn't take long before he returned the kiss, hands finding their way back under the younger man's shirt again. Pulling away a little at Merlin's insistence to get his shirt off, Arthur shivered from both the air and the other's soft fingers.
Pulling Merlin closer to him once the other man had taken his own shirt off (if that was even possible), he let his hands roam down and palm him again. Leaning in, he moved to trail kisses along the warlock's neck, nipping at the soft skin harmlessly. "Merlin..." he murmured in his ear, moving to undo the other's jeans and slipping a hand inside to feel his length.