Based on this LOVELY gifset (where during dinner Eric Hale is slightly irritated by Stiles and Derek flirting with each other, because how could he miss that there is something going on between his best friend and his older brother)
“So, Derek,” Stiles says, scraping his fork idly over his mashed potatoes.
Derek looks up at him, lips quirked at the edges, and Stiles gets a sudden, horrific image of Derek making that same face when he’s crouching on the floor, hands on Stiles’s hips, lips brushing over the head of his dick.
Eric gives him a weird look.
“Uh,” he says hurriedly, face flushing red. “Uh, how’s work going? You still a mechanic? Doing mechanic-y things?”
Derek snorts softly, nods his head. “Yeah, but it’s not easy. I accidentally got grease everywhere today,” he sighs, picking at a dark spot under his fingernail.
Stiles closes his eyes against the image. Greasy Mechanic Derek Hale may or may not be one of his Top 5 Jerk Off Fantasies.
“It was,” Derek agrees, looking up to meet Stiles’s gaze with a playful smirk on his face. “Unless you’re the type of person who likes getting dirty.” Stiles presses his legs together under the table as a bolt of heat flashes through him. “You should come visit me at my garage sometime,” Derek says, voice neutral.
What if every time someone showed Mark a picture of their kid he just pulled out 8 million pictures of us to show to people. It was a strange thought that came across my mind. It was funny when I drew it I swear.