Does she mind if Lydia's hand makes its way under her shirt?

Oh she does not mind at all -

Nibbles, then, and various other kinds of exploration. 

That is very good.

"Someone's coming," he suddenly snaps.

(Ade can recognize Scott by scent before he comes close.)

She pulls away and suddenly looks as if she's as innocent as anything, slipping a hand around Stiles' waist.

Lydia stands by her man.

"There you are! I was looking for you..."

Sniff.

"...everywhere." 

"Sorry. Lydia was just helping us figure out this problem. It was giving me trouble all day, you know how I am when I can't solve a problem."

She giggles. "Is something the matter, Scott?"

"No, I think we're okay. Stiles, we should go."

"Is this the new thing, or the usual thing."

"Usual thing. Ade can come if she wants."

"It's probably not her thing. I'll ask. Meet you in a few minutes."

She raises an eyebrow at him.

Jackson and Lydia ignore those losers, and wave goodbye to Ade.

"So. Scott and I have this tradition where I steal my dad's old case files and we try to solve them. It involves sneaking into the hospital morgue, checking out abandoned buildings, that kind of thing."

She blinks and grins. "Sounds fun count me in. Also Scott you should probably just ask."

"About how far you went with my best friend, his arch rival, and his childhood crush? Or whether you want to investigate old murder cases? I think we've covered both."

"First thing actually, I'm pretty sure by scent alone you can't figure out exactly how far anyone went anywhere." She glances at Stiles. "Although you can probably at least guess who."

"I don't need to know how far, I really don't need to know anything. I hate knowing things, it's terrible." 

"Love you too, Scotty. Ade, do you need to call your mom?"

"Nah I'll text her." She does.

"Cool. I'll find the case file."

A peck on the cheek, and he's running for the parking lot.