"Easy," Derek cautioned, slowly sliding the dildo back into the boy's waiting mouth. "I'm going to fuck your mouth, before pushing it deeper," he said, and plunged the dildo in and out of Stiles' mouth, shallowly.
It was a testament to Derek's control that he was able to function while sporting an increasingly uncomfortable erection, brought on by Stiles' eagerness and the obscene way his mouth looked when wrapped around the dildo. He could only imagine how it would feel when he finally let the boy have his cock.