cain nonconning sam in front dean because sam reminds him of his abel and his colette
Cain tying Dean to a chair and making him watch the whole performance. Cain forces Sam on his knees, hands tied back and he makes him suck him, holding Sam's nose until he openes his mouth. Cain talking and mumbling all about how mouths of little brothers were just the best and how Sam is almost as good as his Abel.
Sam is forced to turn around too, face down, ass up and just so that Dean can see Cain sink inside where only he is allowed. Sam tries so hard to stay silent, but damn does Cain know how to find the right angle. Cain keeps up a running commentary, comparing Sam to Abel and Colette, how he's surprised that he's so tight and how Dean must have not been taking good enough care of him but how Cain would now do it for him.
Dean sits there, rock hard and so pissed he can't see straight, fighting the ropes like he never had before.
(Dean would eventually get free and kill Cain while he would still be inside Sam, dragging the body off and out of Sam before filling the place himself)









