Cass chuckled slightly, flipping Marcus around so he was pressed against the counter, bending him forward. His lips and teeth found his bare back, slowly working his way down his spine before coming to his waist, fingers hooking into the band of his shorts and pulling them down in one quick motion. Getting down on his knees he spread apart Marcus' cheeks, letting his tongue delve between, pleasuring him, but also lubricating his body at the same time.
Merlin, he loved the way his boyfriend moaned and squirmed when he did this... and though he was more than sure he could get him to come just doing this, he wanted to feel his lover come apart around him.
So standing up he pulled off his own bottoms, stepping out of them before pressing his length against Marcus' entrance, the head teasing his tight heat. Leaning over he whispered into his lover's ear, "Tell me how much you want me.."