You decided to just leave them out.

You left the case open while you checked the configurations on the handheld reader, the screen blinking on and flashing up with the lab logo for a moment before the settings popped up. You picked up a cotton swab then stuck it into your own mouth and scraped it a bit against the inside of your cheek. You squinted at it when you took it out then popped it into a fresh tube of solution then slid the tube into the machine. It hummed and beeped and whirred for a few seconds, reading your sample, then displayed green boxes and letters that cleared you of any trace of the disease. That preliminary test done you disposed of your sample then started to count how many swabs were left in the container.

You were halfway through when your aunt stepped back into the kitchen, a lot quicker than you thought she would be, her skin quite pink around the neck and a fine sheen of sweat on her forehead.

"Okay," she sighed. "All done." She was on the other side of the counter again, like some kind of divider always between you two. You couldn't help but wonder how she would have looked, laying on her bed fingering herself. You imagined it. "What are those?" she said, cutting through your daydream. You looked down at what you were doing.

"Oh. They're just swabs. I'll use them to collect your sample like before," you said.

"Not those. Those," she said, leaning on the kitchen counter now and pointing to your opened case.

"Ah..." you smiled, glad she took that bait. "They're other sampling sets. Other ways to collect data."

"Other ways?" said your aunt curiously, intrigued no doubt by the shapes of the devices.

"Yeah, there's different ways to check on the severity of your addiction and review the markers," you said, nonchalant. "Like this device we use to check the skin cells and saliva." You lifted up the handheld screen you just used on yourself. "It's okay for readings but some other... biological samples have more indicators in them that we can analyse. They provide more accurate results. These other machines read those."

"This thing looks like a vibrator attached to a smartphone," she noted flatly, pointing at on of the aptly described device. You nodded.

"That one we use to sample any natural fluids produced from the vagina directly," you said, remaining clinical. "Most accurate readings come from those fluids." She raised an eyebrow at you. "We can just do the swab machine. It'll be good enough," you said, smiling nervously.

She picked up the device that was basically a white plastic dildo, the phallic part of it a detachable piece from the actual machine that did the readings. The dildo part had specially designed ridges on it that would channel fluids into a central line, which you liked to call the vein, in the middle of it. It also had a large divot just below the 'head' of the dildo, like someone had taken a scoop out of it with a spoon.

"This gives better readings though?" she said, turning the thing about in her hands to study it.

"Yes. It would make the results for the next two tests we do a lot more accurate," you explained. She swallowed, eyes transfixed on the device.

"Okay I'll use this then," she said. She turned to you with her mouth to one side. "It's clean right?"

"Never been used," you confirmed, heart in your throat.

"Alright," she said, a small smile on her face as she looked back at the device. "What do I do with it? Do I need to... get off again?" As much as you wanted to tell her yes you remained professional. You guessed she would still be wet enough now to provide more than enough for one sample.

"No, you just need collect a bit of your fluids on it," you said, leaning over and pressing a switch on the side. The screen on the base lit up then you tapped another button. "You just ... uh... put it in, maybe move it around a little bit, and then it will beep and the light will turn green when it's collected enough. Only takes a few seconds, depending on how lubricated the user is."

"Oh still plenty lubricated," your aunt blurted without thinking. She bit her lip and gave you a look and you just waved it off casually. Expecting her to retreat to her room to get the sample you started to pack away the other devices. You almost dropped the box of swabs when your aunt put the dildo back on the table and went to remove her shorts right there. "No peeking," she said to your wide-eyed expression. You blinked, remaining calm and collected on the outside while internally somersaulting.

"I would need to leap over the counter to to see anything," you noted jokingly. It was true though, the kitchen counter still provided the best barrier of modesty in your aunt's house, aside from the woolly blue blanket on her couch.

"No leaping over the counter then," she amended with a smile. The way your aunt shimmied out of her shorts was making you hard again and you busied your hands with the container of swabs as you watched her. Your aunt picked up the dildo reader and it disappeared behind the counter. Holding your breath you tried to tune your ears into becoming the most sensitive sound receivers on the face of the planet. Your aunt was looking down, not paying much attention to you, and her breathing was slow. She sighed just a little as she touched the device onto her skin. "Ohh... it's warm," she noted in surprise.

"Yeah, the device has a heating mode," you explained. Your aunt nodded and from the expression on her face and the quiet wet sound you were probably only imagining, began to slid the it into her pussy. She left it there for a moment, obviously enjoying the feeling of it inside her. You could see her constantly licking her lips. Then you heard soft squelching sounds and your aunts body language made things pretty obvious. Her shoulders shifted slightly, her eyes closed and her mouth hung open. She was slowly fucking herself with the dildo, right in front of you, her wetness echoing in your ears. Then came a long beep from down between her legs and your aunt let out a sigh. You heard her pull the device out and it reappeared above the counter, shiny and slick. You both stared at it, a small pool of her liquids collected in the little bowl of the divot thanks to surface tension.

"Now what?" she asked you, her voice unusually high. You reached for the device and she handed it to you carefully, letting you grip it by the machine part and not the dildo end. You tapped at the screen and the machine beeped again, a small whirring noise coming from inside. Staring at the thing you were fighting every urge in you to manually analyse the fluids with your tongue. You had half a mind to bring the damn thing up to your nose and just sniff. The smell that drenched the device wafted tantalizingly to your nostrils. You tapped another button. The advanced plastics that the dildo part was made from were slightly porous and it hummed quietly as it absorbed the rest of your aunt's juices. It started to cycle the data and analysis began. Aunt Les watched the device curiously.

You let it do its thing until some results came up on the screen. You nodded at the readings then saved them as "set 1 sample 1" and then grabbed the dildo to unscrew it from the device. Your aunt gasped like you had just slapped a puppy.

"Most of the fluids have been absorbed," you said, showing her the detached dildo which visually appeared to be dry again. "We're working with pretty cutting edge technology here." That seemed to placate her and she nodded, though to be honest you probably should have been using gloves. You took out another one of your cases which had a big BIOHAZARD symbol on the side and retrieved a cylindrical metal canister out of it. It was empty until you dropped the used dildo in. Your aunt seemed crestfallen that the dildo was being thrown away. "We recycle the plastics," you assured her as you screwed the canister's lid back on.

"How very environmentally friendly of you," she said sarcastically. She turned and went to the kitchen sink to wash her hands. You swallowed, because once she moved you could see past her waist. She hadn't pulled her shorts back on and you were treated to the most stunning sight of your life. Her round ass was perfect, the curve bouncing with each step, her skin somehow smoother than anything you had ever seen. You collected yourself and though your mouth was now dry you spoke up.

"Uh... Aunt Les..." you started, raising a finger weakly. She turned around casually, now exposing her completely shaven pussy to her nephew. Completely bare she was completely bared to you.

"Hmm?" Her eyebrow rose along with your cock. You swallowed and throbbed, eyes unable to pull away from what you were seeing. You pointed.

"You forgot to..."

Your aunt's eyes went wide, her brain taking a second to catch up as she looked down at herself. She squealed, covering her crotch with one hand and diving down behind the kitchen counter. You heard her hit one of the cabinet doors and winced. "Are you okay?" you called to her over the counter.

"Yes... ow... yes," came her embarrassed voice. There weren't any further sounds or movements for a few seconds and you stood.

"Alright then... I'm gonna go catch up on some research and do some further analysis on this," you told her, snapping all the cases shut and pulling them off the counter. You started to walk away from the kitchen.

"Okay. I'll call you when lunch is ready," your aunt said, still red behind the counter.