Derek chuckled as the boy gripped him just to stand up. He really did know how to bring the boy to his knees. "I think you are doing just fine." He said, pressing a kiss to the boy's temple and turning it up one more notch. He was being slightly evil, but he knew from experience Stiles liked it a bit rough.
Whispering into Stiles' ear he said, "And the sooner we shop the sooner I will take into an alley and turn the plug all the way up as I fuck that mouth of yours. Maybe if you are good enough, I will come inside you again."