You stared at Ristan for a full minute wondering how this plan even entered his mind. Seeing as you could change back any time though, and there was some chance of ending up with a pair of real kinky sluts as roommates, you shrugged and agreed.
Swapping around Ristan and Kalzbin's genders was simple enough, but doing that alone didn't exactly have the most appealing results. The incubus turned succubus was clearly a total slob, and bodybuilders all kinda looked the same regardless of gender. So a few more tweaks were clearly needed.
Conjuring up more details to alter, you gave Ristan the more traditional succubus look. Impossibly narrow waist, wide hips, spurs on the bottom of her feet to serve as built-in high heels, long tumbling hair, a much nicer face, petite little horns, better complextion... no need to go too overboard but you definitely ended up with a little demonette you hoped would charm the pants off you without any supernatural influence if you hadn't just turned yourself into a girl who didn't seem to lean that way just now.
For Kalzbin, you were feeling a whole lot less creative. Big blue bimbo eyes, some slimming down, but mostly you just cranked up the size of her breasts until it was clear she was having a hard time standing with them. You didn't shrink them down once you hit that point of course, just strengthened the muscles in her lower back a bit, and made her arms a bit longer. She probably couldn't keep on her feet all night like this, but anyone having a one night stand with a busty minotaur was eventually going to want her down on all fours with those big ol' jugs swinging like pendulums, right?
Clothes were still an issue, and not really your strongest suit creatively. You tweaked Ristan's robes to be super tight with slit legs. Kalzbin's you altered to be pretty loose and held together with a big thick belt and kind of a lace thing by the collar. For yourself, since you knew there was no way these two were going to just go on without you, you really just focused on making things fit right. Bit long sleeved, oversized hood, that way you could hide in them if things started to get too weird. That out of the way, you stashed the Chronivac under your bed and let Ristan take the lead.
Things went pretty smoothly at the first bar. You all strode in like you owned the place. Bunch of guys started drooling over your roommates. Everyone was falling over themselves to offer to buy you all drinks. You did your best not to go overboard, knowing Ristan wanted to hit a few places and really not wanting to pass out in an alley. That would be a real problem even if you weren't temporarily a woman.
After an hour or so, you noticed a few of the guys in the place looked pretty cute, and really had to mentally kick yourself for forgetting that the defaults on that Chronivac thing apparently handled sexuality in such a way that if you were straight to begin with and changed your gender, if you didn't alter things to be otherwise, you turned out, you know, the other straight. But you hadn't given yourself a massive libido or anything, so that was mostly annoying and weird.
You also realized you didn't see Kalzbin anywhere. Apparently someone was feeling... adventurous tonight. Who'd have guessed? Other than that though, things proceeded pretty smoothly for the rest of the night, right up until they didn't.