Scott had pressed the drain button while it was pointed at Jessie who was too busy looking at the glass jar, and then she felt a sucking sensation and some liquid was entering the jar... but she started feeling smaller and like... Her life was being sucked away and... her mind...
"SHHHI-hhh What the helk?" Dave asked as he saw Jessie shrink into her clothes and as they checked they saw she had turned into... a glass jar? Dave then realized he was holding Jessie's shirt and ended up seeing her panties on the bottom of the glass jar. Dave blushed a bit from that...
Scott saw the Jar now with a colorful liquid in it and said "I think this is... Jessie?" They stood on opposite ends of the Humanity drainer, and then Scott's finger slipped as it hit the third button. Scott felt the odd as something was being added onto his existence while also being taken away, the color of the liquid in the jar was shifting before Scote's eyes. Scoie had the feeling that they were treading on the most intimate of grounds, and their clothes felt wrong on their body now as their flesh shifted. Scssie grabbed the Humanity drainer and yanked it away from Scott as Jessie now had possession of Dave's humanity. Except it wasn't Jessie exactly as some core amount of Dave was in the Jessie in Dave's clothing. Jessie grabbed her clothing and the spare jar, and said "Go over there for a bit while I get decent!"
Behind a pile of scrap in the junkyard Jessie took off Dave's shirt and put her bra back on... only to find it being oddly tight, it wasn't like this was it? Putting her panties and shorts back on... the panties were mostly fine but the shorts felt like they were digging into her hips... Then an idea popped into her mind... Had she gone through a growth spurt? Her clothing were just a little tight, but Dave had been half a year older... Did this thing not do THAT when it did so much else?.. Now that Jessie thought about it why did she change into her clothes? I mean it felt natural, but was she going to... She'd ask Dave on his opinion as that feeling of your entire identity being messed around was... a little freaky... She placed the jar into Dave's boxers and shorts with the shirt nearby, and fired one of the buttons at it till she got the infusion option. The jar started growing, and then Jessie went behind some other scrap.
Dave felt very confused and his... boxers and shorts were around his feet... "get your clothes on right, and we'll talk" Jessie said, and Dave felt very willing to accommodate. A bit later the two looked at each other, both feeling very much like themselves and yet... They both knew at their core they had been nearly completely swapped. "So... umm... I just wanted to get your opinion... if you wanted to go back now?"
Dave thought for a second and said "I think... I need some time before doing THAT again... Just having EVERYTHING taken from you is..."
Jessie nodded as there weren't a word for that sensation "I think I get it, My stuff was sucked as your stuff was being given so not the same same but..." The two didn't talk about how Jessie was now bigger than Dave had been when he had been Jessie... Just accepting that the other could be... Well the other for at least a day or so? Just till they were less uneasy. They went back to Scott where they started to head back home with the Humanity Drainer in hand.