Based on this prompt from phoenixmar on Tumblr: With the addition of Roy & Sara, the Arrow Cave starts looking/smelling like a locker room at the Y. Put upon!Felicity didn't sign up to be Team Arrow's towel girl. Pre-Olicity UST, Delicity BrOTP.
"OK, that's it!" Felicity yells, going full Loud Voice. Oliver and Diggle stop sparring for a moment and turn to find her angrily jabbing her finger into the flesh of Roy's bare chest. Diggle almost laughs at how terrified he and Sara look.
"It is bad enough that I have to just sit here and watch you guys parade around half-naked all the time," she says angrily. "Like this is some kind of twisted candy store where I'm not allowed to purchase anything instead of the base of operations for a bunch of vigilantes." She pauses to pick up the sweat-drenched towel that Roy hung on one of her servers. "But you will respect the tech. This is not a gym and I am not your mother. So clean up after yourselves or so help me."
"OK," Roy mutters, sounding dazed. He glances down at where Felicity is still pressing her finger into his chest and she suddenly grows timid. She starts to pull her hand away and then seems to change her mind, biting her lip and then spreading her fingers out over Roy's chest before quickly running her hand down it.
"As you were," she says when she pulls her hand away, raising her chin in defiance of his startled expression. Oliver frowns in annoyance and steps toward them.
"Roy, grab a bow," he says, "you should be focusing on target practice anyway."
"Oh come on," the boy whines. "What's the point? I'm terrible at it."
"Won't get better if you don't practice," Sara says and claps him on the shoulder.
The three of them walk toward the targets, but Diggle goes to Felicity's desk, where she is now staring very intently at her screens.
"A candy store, huh?" he asks and leans against her desk.
"Not a word, John Diggle," she warns without looking up, but he can tell she's fighting not to smile.
"I'll make sure they clean up from now on," he says sincerely. "Just promise you won't feel me up during any angry outbursts," he adds and turns to go, but he's stopped by the sound of Felicity's voice.
"I make no promises," she says. "Have you seen your arms?"