There were many, many reasons that Robin liked Felix so much, and only some of them had to do with sex. But the way he took Robin's cock was definitely one of them.

Robin groaned, eyes flickering closed for only a moment as he realized that he'd much rather see Felix's face than revel in his own physical sensations.

He lifted his hips just slightly, meeting him, then breathed, "Fuck me. Now would be good."