Not just having sex with underwear still on, but also using them as a sex toy or bondage/chastity item. Dry humping/grinding, using them as a gag, edging the subject and then making them cream their skivvies, face sitting while wearing underwear, etc.Maybe have a serum that makes subjects react negatively or positively to certain underwear colors. For example red/purple/blue/black undes would make the subject more aroused, but brown/white/grey/biege underwear would make them lose arousal and so on.

Briefs
Boxer-Briefs

Boxers

Trunks

Jockstraps

Speedos

Thongs

G-Strings

Panties

TL;DR: Someone broke in, managed to get rack'd, and needs to be taught a valuable life lesson. You're encouraged to be mean / vulgar (though still not outright injurious, obviously), moreso even than the paid subjects. Could be gated behind the purchase of a security system, the A.S.S./F.U.C.C.C. (Automated Security System / Fully-Unfair Catcher of Cunts and Cocks) or something equally ridiculous).

Description: So, you've had your morning coffee, and you're ready for a day of work -- fun work, but still work. You head down the elevator ... and there's someone already in the Blue Room rack. Wait. You hadn't scheduled anyone to be in there yet. What gives? Upon investigation, you discover someone who had broken into the facility to ... who knows. Maybe they were placing a camera somewhere for a lifetime's supply of porn; maybe they were there for the awesome constellation of dildos; maybe they were a moron doing an awful YouTube video on "DIY Breaking and Entering." Either way, somehow, they ended up strapped into the chair, and you discovered them. You can a) let them go, b) turn them over to the police for a reward, or c) ... have "fun" with them, in which you're encouraged to be mean / vulgar to them for their cumuppance. Of course, there's a limit -- we're not recreating Saw movies -- but a night of intense experimentation is probably more desireable than a year in prison.

Could be tied to a security system you can buy; like, maybe one of the items researched is the A.S.S./F.U.C.C.C. that doesn't have a clear function, but once bought, will give you 'robber' scenarios like this one. Because. People break in. A lot. For some reason. Something about this society having troubles with personal boundaries.

Add the ability to adjust the rack, or purchase different racks to force various compromising poses and easy access to the subject's various part - FOR SCIENCE!

visible shaking and pounding of chest when heart is beating hard or fast.

Some Petplay related Items would be really nice.

I am talking rubber paws, tailplugs, rubber hoods, leashes etc.

and not only for puppy play, but also pony and pigplay.

Enemas are large syringe shaped tools that have a dull nozzle instead of a sharp needle because they go in to the butt. Like right up there, for the propose of injecting fluid into the rectum. Said fluid is eventually expelled, but that detail gets glossed over sometimes.

They are mainly used to in medicine. But they are used in kink as well. I don't know why, but I chose not to question this. In Rack2, I suggest that the enema be used to inject these new mystery chemicals that Fek keeps alluding to. Or general purpose fluids that have been dyed normal and zany colors. With food dyes. Other dyes would be medically ill-advised.

Because Rack2 is a digital environment that allows us to exclude details we find to be unsavory, I suggest that only materials injected into the rectum should the be only things that are subsequently expelled.

Because poo is gross.

Putting a finger inside the butthole and massaging the prostate while stroking the dick at the same time.