Yes, they were having sex. Finally it was not just teasing and coming from each other's fingers or mouths. He was going to push into that tight heat in just a bit. "Fuck." He groaned. "Stiles I need you relax. You have had my fingers inside before." He said, moving the finger in and out slow, before pushing in another beside it.
The boy was still not backing out, and Derek hoped he would not. So he decided to sweeten the pot by taking Stile's cock into his mouth, sucking hard.