Well, in the first book, Diane is both the first and last one who's tickled, so it's the introduction to the world of tickling and the closing thought upon it!
🙂 She will get it everywhere from giggle-inducing all the way to tickled to the very boundary of what she can take!
While we're waiting I'll throw in some non-spoilery info. Since this is ongoing, the supporting cast is being more developed. I call them the A cast, B cast, and C cast; in the trilogy Eva, Tricia, and Star were the A cast, Diane and a few of the Sigmas were B cast, and Roxi, Corey, Kat, Todd were C cast, to show how prominent they were in the story. Because we followed and learned a lot about our trio of pledges, they're being pulled back to allow Diane and Roxi to be the A cast, Megan and Eva will be B cast, Tricia and Star C cast.
Barton and Donnie, though, will be making a big jump, as close Sigma allies. Donnie is, overall going to be B cast (his role gets bigger the further into the series we get). Barton is to the point where I'd call him A cast, since he's Diane's confidante, the one she can turn to for a sympathetic ear and counsel. As a result, we'll be spending a lot of time in Barton and Donnie's campus apartment, it's a fun place for the Sigmas to visit. To picture it: you step into the main room, and on your right is a small kitchen. To the left is a hallway, but before you reach it, there's a wide closet with slats on the doors. Up the hall on the right is the bathroom. On the left is Donnie's bedroom. The end of the hall is the rec room, a bedroom they use for playing games, Barton and Donnie are hot guys, but they're also geeks (the Sigmas saw their potential as allies and helped them keep what they liked about themselves while turning into the campus heartthrobs that even the Sigmas sometimes hook up with
😉 ). So they can do anything in there from playing cards to massive elaborate battles with miniatures.
The main room is where Barton sleeps. They built a small dais to hide some of their less-than-approved engineering activities, and on it is Barton's big bed. He also has his dresser and a suit rack with his clothes out here so the game room isn't full of it. There's a couch next to the bed. But the most prominent structure in the room is something they themselves built called The Wizard's Tower. It's a piece of wooden furniture that, looked at from above, is a hexagon, with each side four feet wide. It's six wedge-shaped nooks that have all been locked together and goes all the way up to the ceiling. Each nook has a desktop, drawers, and often shelves and/or cupboards. It serves as a workstation and place to do homework, but they've also filled it with complicated technology (they're geniuses). They built cooling systems into it for all the tech, and for fun, they even have turned a couple of the drawers into beverage coolers. Mounted on the side facing the bed and the couch is a big screen TV. So even though the Sigmas have their own theater, it's usually more fun to hang out with Barton and Donnie watching whatever esoteric movies they've found.
And of course, as lovers of ticking, you can guess that some of the drawers of the Wizard's Tower are where they keep whatever the situation might be called for with a visiting Sigma...