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“You're under my jurisdiction," Derek says with finality, not leaving any room for argument.
Stiles argues anyway. “Um? I'm Scott's spark.”
“And Scott is in my pack.”
“I answer to Scott before I answer to you.”
“Scott has to answer to me first.”
Stiles throws his hands into the air and makes a noise of frustration - something crossed between a growl and a grunt. “Okay, fine! Fine! You're the fucking boss of me! I'm just a piddly little spark and you get to boss me around and tell me what to do! Does that give you a hard-on or something?”
(or the one where Stiles is a spark that starts losing control of his magic, and Derek is an alpha that's too chicken to ask Stiles to join his pack.)