Sean thought that it was particularly unfair when he went down with some appalling disease on the first day of the summer break. Everyone else seemed to think that it was just a cold, but he knew it was way worse than that.

For the first three days, he didn’t really leave his bed, alternating between sleeping and creating and disposing of industrial amounts of snot, making his nose red raw and himself even more miserable.

His mother looked in on him each morning before she went to work, laying her hand on his forehead, tutting, telling him what nausea-inducing meal she’d left in the microwave, and then kissing the top of his head before she left him to it. She also always left him a glass of blueberry juice, which she swore by as a cure for pretty much everything.

On the fourth day, he bravely looked at the contents of the Tupperware container, but went with a bowl of cereal and milk instead.

His big sister, Hailey, also checked in on him occasionally, but always stood just inside the door for fear of catching whatever it was that he had.

He knew he was getting better on day five because he woke up with a boner, his first of the week. After his folks had gone to work, he manfully fetched his laptop from the desk, pulled up his favourite porn (lesbian NOT sisters) and jerked off a couple of times. Exhausted by that effort, he slept till lunchtime and then heated up the casserole in the microwave. After that, he felt a lot better, except for the lingering cough and snootiness.

By Friday, he was so much better that he was starting to get bored. Hailey had stuck her head around the door early on and said she’d be back at lunchtime and she’d cook him lunch, if he wanted. He’d jacked off a few times and then got himself a large glass of blueberry juice from the refrigerator and was mooching about the house while he waited to recover enough to knock another one out.

It was the thought of Hailey’s bedroom, unguarded, that made his cock give a little hopeful twitch. He wasn’t usually allowed in her lair when she wasn’t around, but it was hours to lunchtime, so he was pretty sure he’d be safe.

He went in, breathing in the lovely scent of an eighteen-year-old girl’s boudoir: perfume, weird little pots of dead flowers, and ... assorted other stuff. It was very pink and very girly, and he had a cursory look around before heading toward her chest of drawers.

Just to prove to himself that he wasn’t a complete pervert, he put his juice down and picked up a few of the perfume bottles, sniffing at the caps. They smelt of Hailey, which was nice, but, having proved what a straight-up guy he was, he began opening drawers looking for what he was really after. The top left revealed her bras, which were nice. Checking some labels, he confirmed that Hailey was, as he’d thought, a C-cup, and then he found a silky red one that was so tiny it would hardly cover anything, and it fascinated him. He held it up, trying to imagine what she’d look like in it, and his cock made an appearance out of the fly of his shorts. Giving it a fond little stroke and unspoken promises of fun later, he moved on and grinned when the next drawer revealed her vast collection of panties!

There were all sorts in there: from white and pastel shades of what felt like cotton, to slinky, silky, and very sexy numbers, but they all had one thing in common - they’d all been in intimate contact with his sister’s pussy! He lifted out a pink cotton pair, brushing the material against his cheek, before raising them to his nose and breathing deeply, hoping for a hint of ... well, he wasn’t really sure, but hopefully something sexy. Unfortunately, they only smelled of washing powder, but just the idea of where they’d been made his cock as hard as fuck.

Next, he picked out a pair that presumably matched the red bra: tiny scraps of material that, after a bit of unravelling, he figured would barely cover either the awesome cheeks of her butt or her pussy. Just imagining how she might look wearing just the bra and panties required another few rubs of his erection.

Then he discovered a single tiny triangle of white material with some thin straps attached. It was then, with the thong covering his nose, that he remembered about the washing basket. Cursing himself for not thinking of it sooner, he jammed the panties back in the drawer while simultaneously trying to push it shut and pick up his glass. Unfortunately, in his fevered haste, he managed to knock the glass and its contents into the still-open drawer.

He watched in dismay as the reddish-purple liquid began to soak into the pale material. “Fuck! Fuck! Fuck!”, he hissed, wrenching the whole drawer out and running to the bathroom with it. By the time he’d dumped the entire contents into the bath, all but the black pairs had turned varying shades of purply-blech.

He tried to calm his pounding heart - he still had ages before Hailey was due back, and he could fix this. Wringing out the panties as best he could, he put them back in the drawer and headed down to the kitchen.

He’d vaguely seen his Mom use the washing machine, but never really paid too much attention. He poured some washing powder into the drawer that he was pretty sure she used, then peered at the control knob.

Better safe than sorry, he told himself as he wound it round to its maximum setting - ‘Hot - Heavily soiled’.

He hit the Start button and, happy that it would all work out OK, he set about cleaning the drawer.

As the clock wound round to eleven-thirty, and the machine was still running, Sean began to pace around the kitchen, cursing. When it finally entered its spin cycle, his heart rate began to calm a little. And when it stopped and began beeping, he thought that he was nearly home and dry.

He opened the door and looked in despair at the reddish-gray mess inside. “No, no, no, no!” he cried, pulling them out. Maybe they’ll look better when they’re dry, he hoped frantically, ramming the whole lot into the dryer, this time going for the fastest cycle.

Twenty minutes later, he had a much drier but still very much reddish-gray mess. With a sinking heart and a rapidly growing sense of doom, he carried the whole lot upstairs and dumped it out onto Hailey’s bed.

He was just picking out the black pairs, most of which looked OK, when he heard footsteps on the stairs.

“What are you doing in my-- What the fuck have you done?!” she screeched, standing over the bed and looking down in horror.

“I’m sorry,” he whimpered. “I’m so, so sorry. I didn’t mean to ... I wasn’t ... I didn’t...”

She turned around to face him. “What exactly were you doing in my panty drawer?” she asked icily.

“I-I-I-I-” he stammered, “I-I’m sorry,” he finished lamely.

“Were you sniffing my panties?”

“No ... Well, yes. But–”

“Were you masturbating while you played with them?”

“No ... No! ... Well, yes.”

Make no mistake, Hailey was severely pissed at the state of her underwear, but she was also somewhat amused at her little brother’s discomfort. Although outwardly she was trying to look furious, she was also more than a little aroused at the vision that had popped into her head of Sean, getting all hard while sniffing her panties, and stroking his cock. It hadn’t escaped her notice that her little brother had been turning into quite a little cutie over the past year or so. It may also have been a factor that Hailey had broken up with her bastard of a boyfriend, Vince, three weeks earlier, and she was more than a little frustrated.

“Do you know how much these cost?” she demanded.

“No, not really,” Sean mumbled into his chest.

Hailey scanned the assortment of panties, roughly adding up how much she’d paid for them. Since they weren’t new, she figured they wouldn’t be worth that much, which sent her mind off on a tangent as she wondered how much her dirty panties might be worth...

Dragging her mind back to the issue at hand, she said, “About three hundred bucks,” going with the cost price. “How are you going to pay me back?”

“I could get a Saturday job,” Sean suggested after a few moments’ thought.

“So, how will you explain why you’re doing that rather than football practice? Sorry, Mom, I was playing around with Hailey’s panties and–”

“Alright! Alright! So what do you suggest then?”

“You’ll just have to work it off,” Hailey said.

Sean frowned: he wasn’t aware that he had any skills that were worth anything. “I don’t understand,” he admitted.

“Pass me that pad,” she told him. “And a pen.”

He watched as she scribbled a few things down, chewed thoughtfully on the pen, and then added some more.

The first few were just normal chores that any daughter might have to do. But, as she thought about it, there were some things about having a boyfriend that she was really, really missing, and she tried to figure out how much they were worth to her. The more she thought about those, the hornier she got and the more inspired she felt. She wasn’t entirely serious, but she definitely liked the idea of shocking her little brother. This is what she wrote: