Will's house was the closest of the boys' destinations, and he was glad he was able to avoid anyone seeing his naked body as he pulled his bike up to the back of the house, the nearby woods keeping him out of view of most of the town.

The 13 year old gave a sigh of relief as he found the key was still under the mat by the back door, and he was careful to make as little noise as possible as he crept inside. Though there was no one in sight, he kept one hand cupped over his penis and balls just in case, and was glad he did when he heard Jonathan and Nancy's voices coming from the living room.

"Come on Jonathan, you said we were gonna focus on studying first!" Nancy giggled as Jonathan wrapped his arms around her.

"You seem as distracted as I am" the older Byers replied as he kissed his girlfriend repeatedly on the cheek, causing her to giggle more.

Will's eyes opened wider as he heard her voice turn into a bit of a moan and he figured his brother must have started kissing down Nancy's neck. As he felt himself grow beneath his hand again, the younger Byers started to rush, knowing he wouldn't be able to keep his junk hidden if it grew to full length.

Once he was in his bedroom, Will rushed to his dresser and opened his underwear drawer, being careful not to make too much noise. He was confused when he saw there wasn't a single pair of jockey shorts remaining. "That's weird" he whispered to himself, but he knew he didn't have very many pairs and may have just forgotten his mom was throwing them in the wash.

"Guess I'm going commando…" he mumbled as he continued to his shirt drawer, only to find that was similarly empty. Will had given up on staying quiet as he threw open the last drawer and found his pants were nowhere to be found. "What the hell?" he said a little too loudly.

The younger Byers winced as he heard his brother and Mike's sister suddenly stop making out. "Did you hear that?" Nancy asked. Then Will heard footsteps coming toward his room. He looked around and saw there was nowhere to hide. Since it was a hot summer he didn't even have sheets on his bed to hide his nudity so he just placed both hands over his dick again.

Jonathan finally reached the doorway and his little brother saw he looked prepared to fight another Demogorgon. Will could see his older brother was shirtless and sweaty, wearing only his flannel pajama pants. Though Jonathan was surprised to see Will, he also sighed with relief that it wasn't someone breaking in. Nancy blushed as she saw him too.

"Will, what are you doing home… and why are you naked?" Jonathan looked really confused now and Nancy was blushing and trying not to look.

Will couldn't believe Mike's big sister was seeing him like this so he was stuttering. "I-I lost my s-suit at the quarry….s-so I came to get a change of c-clothes…" Will wasn't sure about the chemicals being from the lab yet and he didn't want his brother or mom to get worried about there being danger yet, so he figured he wouldn't mention everything that happened.

"Jeeze, and that was your new suit, Will." Jonathan sighed. Will realized his mom would still get stressed about that but he'd have to worry about it later.

"A-anyway, where are all my clothes?"

Jonathan turned to Nancy and she stepped out from behind him, revealing that she was only wearing a long t-shirt. Will's eyes grew as he saw how sweaty she was so it stuck to her body and he could see her nipples through it.

Nancy blushed even harder as she saw Will's dick was getting bigger and so she stuttered too. "I-I told Jonathan I'd help him with some chores…. S-so I threw everything in the wash…"

Will was confused. "Why everything?"

Jonathan answered this time. "When she got here, she said my shirt looked messy and I said mom had washed it."

Nancy continued. "So I figured your mom must not have a lot of time to do things thoroughly so I'd help get everything really clean."

Jonathan smiled at his girlfriend. "Isn't Nancy amazing?" He hugged her really close again, making her boobs even more visible through her shirt and started kissing her passionately on the neck.

Will was throbbing now. Jonathan was usually really shy and would never do this kinda stuff in front him before. Then he realized he was started to feel the tingling again. "Oh no, it's spreading!" he said to himself.

"What's that, Will?" Jonathan said as he pulled away from Nancy.

Nancy looked down at her shirt and then over at her boyfriend. "I think he's talking about our clothes, we've got our sweat spread all over them."

Jonathan smiled. "That's because you've been doing so much hard work to help us out."

Nancy giggled. "You've done just as much, you big softie."

Jonathan and her began to make out, and Will was even more worried. "G-guys, y-you need to stop and listen to me!" By now his dick was beginning to poke out from between his fingers and he couldn't pull his eyes away from Nancy's chest.

Nancy broke the kiss. "Will's right. We're just going to get our clothes even sweatier if we don't stop."

"No, that's not what I meant…" Will couldn't even finish his thought before something even more shocking happened. He just froze as he watched Nancy grip the bottom of her long shirt and lift it over her head. The younger boy's jaw almost dropped as he saw Mike's sister had nothing on underneath.

Nancy's hot sweaty body was completely nude now, and her breasts and pussy were visible to both Byers brothers. Even more shocking was when she turned around, revealing her perfect ass as she bent down to remove Jonathan's pants, leaving all three equally naked.

Though his head was a bit cloudy from the chemicals, Jonathan was still a little shy. "N-Nancy, wh-why are you doing this in front of Will?"

Nancy rolled her eyes as she picked up the pants and shirt together. "Well he's already naked, so I think he'd probably be more comfortable if we were too. Besides, we really need to wash these clothes too."

Jonathan's hands fidgeted as he tried to decide whether or not to hide his own growing boner, unsure if his brother had ever seen him hard. Will and Jonathan had both caught each other jerking off before, but neither were thinking straight enough to think about that.

Both Byers followed Nancy's hypnotically swaying ass to the laundry room, their boners pointing straight at her through their fingers. Then they both stared as she bent over to put the last items of clothing in with the previous load.

Will couldn't help but notice not every drop running down her thighs looked like sweat. "D-do you guys feel weird too?" Will had to find out if the chemicals were what was making them horny.

Nancy turned around and smiled at him. "What exactly do you mean?" As she said this, she couldn't help running one of her hands down her body, resting her fingers against her pussy and letting out a small moan.

Will could barely speak now, and he started bending forward a bit as he struggled to hide his full five inches beneath his sweat-soaked hands. He knew he had to ask his older brother and his best friend's insanely hot older sister if they were sexually aroused, but his tongue refused to cooperate.

Jonathan spoke up. "Are you feeling okay, Will? You're sweating a lot."

Nancy stepped toward her boyfriend and took his hand pulling him against her and exposing his six-inch boner. "I think he's just nervous being so close to a naked girl." She turned back to Will. "You don't have to be shy. You can stop hiding that thing of yours if it's uncomfortable. I've seen Mike's dozens of times."

Will looked Nancy in the eyes, then turned to look at Jonathan. Realizing it was no use covering it anymore, he slowly let his hands fall to his sides, letting his 13-year-old dick bounce up and down a bit before resting in position pointing straight out horizontally.

Nancy giggled. "Besides, your big brother's is the one causing all the trouble right now." Jonathan suddenly gasped in pleasure as his girlfriend reached out to stroke his cock.

"Nancy, w-we can't do this with Will watching!"

Nancy gave him another passionate kiss and then smiled at him. "I'm sure he and his friends have seen worse in magazines already… Besides, I know Mike spies on us when we do it at my house, I bet Will has snuck a few peeks when we spend the night here."

Will's cheeks reddened even more. He wondered if Nancy had seen him when he watched for a bit one night. Then he thought about what she said about Mike. Did Mike watch his own sister have sex?

Will's black-haired friend had seemed super awkward when Dustin talked about Nancy's boobs earlier, but he never thought it was because Mike was actually aroused by his big sis.

The chemicals were getting stronger, and Will's mind was getting cloudier. He suddenly realized he was absentmindedly touching himself as his thoughts wandered. Nancy was smiling at him, and Will realized it looked like he was rubbing his dick while staring at her body.

He pulled his hand away, but Nancy objected. "You don't have to stop. Do whatever makes your body feel good."

Will froze up again, so Nancy decided to take matters into her own hands. She seductively walked up to the younger Byers, her hips swaying until she was right in front of him. Then she dropped to her knees and reached out to grab his dick.

Jonathan couldn't help stroking himself now, even as he was confused by what was happening. 'Nancy, what are you doing?"

Nancy smiled as she looked up at her boyfriend. "Don't worry, I have enough hands for both of you." She reached out to grasp Jonathan's thick cock, and got to work jerking off both Byers brothers.

Will knew this was completely out of the norm for Nancy and he should say something, but the chemicals were affecting him just as strongly as they were the two high schoolers. He found himself bucking his hips against miss Wheeler's hand, moaning as he watched her handle two cocks.

Lost in pleasure too, Jonathan reached out to grab his girlfriend's head, running his hands through her hair as he too began to fuck her hand. Soon the brothers were standing right next to each other, giving Nancy a nice comparison between their sizes as she stroked them faster and faster.

But just jerking them off wasn't enough for Nancy. Her whole body was hot and she couldn't help but lick her lips as she saw the sticky pre all over both of their dicks. The boys were stepping closer, giving her a chance to sneak a taste, and leaned in to lick Jonathan's glans.

Jonathan moaned so hard, and Will couldn't help but get a little jealous. "D-do that to me too, p-please…" he gasped, and Nancy couldn't help but giggle before she honored his request. Then she went a step further and sucked Will's whole mushroom cap inside her mouth.

Will's knees felt weak, and he reached out to hold onto Nancy's shoulders as he began to fuck her mouth. Jonathan was jealous of his little brother now, and he held tighter to his girlfriend's head as he began to rub his dick against her lips, fighting for her attention.

Nancy felt like she was in heaven as the two brothers assaulted her mouth, and she began taking turns, sucking on Will's cock a bit while stroking Jonathan's, then taking her boyfriend's in her mouth while jacking off his little brother. Whoever was waiting his turn for her tongue stayed close, grinding against her lips and cheek, desperate to be sucked again.

It wasn't long before Will's balls started to tighten, and he knew he was going to cum. "N-Nancy!" he moaned, and she nodded to confirm she knew what he meant and was ready. She started stroking Jonathan even faster, hoping to finish them both off at the same time.

"I-it's too much Nancy!" her boyfriend shouted as he felt his own point of no return approach.

Both boys felt their legs turn to gelatin as the hottest girl at Hawkins high milked their dicks before doing the unthinkable: she opened her mouth wide and pressed their cocks together, just barely managing to get both tips against her tongue.

It was too much for them, and both Byers brothers started to erupt cum inside Nancy's mouth. Nancy moaned as it was too much to swallow, and pulled away, letting the rest of their loads cover her perfect skin. By the time they were out of cum, Nancy Wheeler's face was glazed in Byers cum.

Both boys collapsed to their knees, completely out of breath. Jonathan embraced Nancy, and the two started to make out again. Will was shocked to see his brother tasting his own cum off his girlfriend's face, then started to look down at their bodies again.

Nancy's pussy was soaking wet, and Jonathan started to play with it as he thrust his cock against her stomach. Will was shocked to see he was still hard even after that huge orgasm, then looked down to see his own five-inch pecker was at full mast as well.

"Guess you two are still raring to go, huh?" Nancy asked with a smirk. "That's good, because I still need to cum."

Jonathan nodded as Nancy embraced him in a passionate make-out session, actually pushing him onto his back as she lied on top of him. Will started playing with himself again as he moved over a bit, getting a better view of her bare ass wiggling while her pussy rubbed against his brother's shaft.

He watched closely as Nancy spread her pussy lips and Jonathan thrust inside her, reminding him of the time he caught them doing it in his brother's bedroom that night.

The problem with the chemicals and the destroyed bathing suits had totally left Will's mind as he started jerking off to the teens' lovemaking. The two had almost forgotten about the younger boy too until they heard his moans join in with theirs, and both turned to look at him.

Nancy smiled. "Will must be soooo jealous of his big brother right now." Jonathan groaned as he thrust his hips upward into her, fucking her harder than he ever had before. "You don't expect me to share my girlfriend's vagina too, do you?"

Nancy giggled. "Of course not. You can have that all to yourself right now." Will started to get sad for a second. Then Nancy reached back with both hands to grasp her own butt.

"But I think his cock is small enough to fit in here." She spread her butt cheeks, and Will's jaw dropped as he realized she was offering her ass to him. He moved toward her almost mindlessly and grasped her soft perfect ass, letting his cock rub between her cheeks.

"A-are you sure?" he asked, still unable to believe this was really happening.

Nancy nodded, wiggling her butt again, and Will didn't waste a second. He squealed in pleasure as he thrust all five inches into the 17-year-old's back entrance, struggling not to cum just from that.

Nancy's mind was almost totally lost in pleasure. She had fantasized about getting double-stuffed before, even imagining Steve and Jonathan sharing her. She could never have guessed she'd give her anal virginity to Mike's adorable little friend, especially while his big brother was balls deep in her pussy.

Whether it was the physical pleasure, the intense thrill of such a forbidden act, or the strange chemicals affecting their sex drives, all three teens found themselves on the verge of cumming within seconds. Not one of them could manage anything more than a primal "cummmmmming!" as they finished at the same time.

Nancy's vaginal and anal walls closed tight around both Byers cocks as she felt the most intense orgasm of her life wash over her entire body. And both brothers slammed deep into her one final time as they unloaded their thick cream into both of her holes.

It was nearly a half hour later when the sound of the washing machine finishing its cycle roused Will from his post-orgasm nap. The three teens hadn't moved from their threesome positions since their climaxes drained all of their energy.

Will slowly began to remember what happened with the chemicals as his head cleared a bit. He realized he should get his radio and warn the others that the whole town's sex drives might be affected, but he decided it could wait a little longer as he thought about how he should tell Mike that he banged his sister.

Thanks for reading another chapter everyone! Next up is what happens to Dustin, and I'm also coming up with other story ideas based on requests I get! Please favorite/follow if you like and leave reviews!