Dean was going dizzy from the pleasure and the fact he felt like most of his blood had gone rushing to his groin and to his face, leaving him flushed and hard beyond reason. He ached all over, and Sam's tongue was ridiculously incredible, drawing low, rough moans from him at every stroke. He didn't know how he ever thought any blowjob was good, after having this one. It was always the quiet ones.
"S-Sammy-- Sam... I can't hold on..." he rasped out, his hand tugging a little at Sam's hair. He was going to come so hard if Sam didn't back off and that finger inside him was speeding up the process far too much. He wanted to come, but he also wanted more, and it was almost ridiculous.
Next time, damn it, he was going to make sure Sam was the one left trembling and whining as he writhed on the bed.