"But I already promised Maya I'd help her with her sociology assignment, Jack." Lori gave an adorable little pout. "Sorry, buddy."
"Oh come on! It's my birthday tomorrow and you're going to be gone all weekend?"
"You'll be fine. Go hang out with your guy friends."
"You know you're my favorite. We were going to watch cheesy horror movies! It's not the same without my best pal."
"Ok, look." She pushed her big glasses up her nose and leaned in. "Why don't you come with me? Spend the weekend at the lake. That's a fun birthday."
"Really? What about the big assignment?"
"It'll be fine. You can help too."
"Ehh, that doesn't sound that fun..."
"Oh come on. What else are you going to do, hang out here and play video games? Wouldn't you rather watch scary movies with me in the woods?"
"Yes."
"Then grab a toothbrush. I'm leaving in a few minutes."
"I don't even have time to pack?"
"Don't be such a girl," she said, punching his shoulder. "It's the woods. There's food at Maya's cabin. What do you need?"
"Okay okay, let's go."
----
When they pulled up to a small wooden shack nestled in pine and juniper, Jack turned to Lori with a flat expression. It was covered in moss, and not much bigger than his garage back home.
"It's great on the inside," she said with a grin. "You'll see."
Jack grunted.
A screen door swung open with a creaking sound from the old spring attached to it, and Maya came out to greet them as they were getting out of the car. "Hey guys," she called, waving. "Oh, you brought Jack? Great, more people for my sociology study!"
Maya was tall with delicate features and skin the color of espresso, and her hair was a cloud of black curls floating around her head like smoke. Jack's eyes were drawn up her long legs until they disappeared beneath her flowy sundress. He didn't know her all that well, but she visited Lori often enough at their college, so he'd spent time with her before and always had a little bit of a crush.
"Hi Maya," he said, smiling. She surprised him by opening her arms for a hug as he walked up. She smelled like flowers, pressing up against him, hair tickling his face as her chin landed lightly on his shoulder.
"Thanks for coming out here on your birthday," she said by his ear. "I really appreciate the help."
"Lori talked me into it," he said, enjoying the feel of her lithe body through the thin cotton. "Should be fun, right?"
"Yeah, I think we'll have a good time! Are you nervous at all?"
"Uh, nervous? About what?"
He glanced at Lori, who suddenly had on her most innocent, "What, me?" face. Maya took one look and put her hands on her hips in exasperation. "You didn't tell him what the study is about, did you?"
"Well, not exactly..."
"Lori! What if he doesn't want to do it? Then you'll have to drive him all the way back and-"
"Hey, hey, now," Jack interrupted. "Don't worry, I'm not going anywhere. Whatever it is, I can handle it if you and Lori can, okay?"
Maya smiled. "Okay."
"So what's this all about? I thought we were just helping with an assignment."
"Well, yes... You see, I'm doing a study on the effects of clothing on social interaction. So my report includes sections on various uniforms and fashions, and..."
"And?"
"And this weekend Lori agreed to help me collect experimental data on social interaction without clothes."
Jack blinked. "Like, without any clothes? At all?"
"That's it exactly. We're going to spend the weekend completely naked, and I'll take notes on how that affects our behavior. So you can see why I'm so happy to have another participant in the study! It's an unusual favor to ask, you know?"
"Wow, okay." He gave Lori a shove. "You didn't think that was maybe information worth sharing?"
She shrugged, grinning. "Wasn't it more fun as a surprise? I think it was more fun."
Maya rolled her eyes and smirked. "Alright, guys, so are you ready to get started?"
Jack's mouth was dry. He looked at the girls, as the reality of what they were about to do sank in. He nodded.
"Let's put the clothes here in the car," said Maya. "Out of the way so we just don't think about them until the weekend is over."
She grabbed the hem of her dress and casually lifted it up, revealing her slender, naked body. Jack watched as her shapely thighs came into view, and then her perfectly smooth vulva. He licked his lips. She pulled the dress over her head, revealing lovely light brown breasts topped with nipples like melted chocolate, and tossed it in the car.
"Dammit Maya," said Lori, pulling off her t-shirt, "You're so fucking hot. If I looked like you I'd be naked just to show off."
"Shut up, look at that booty on you!"
"Yeah?" She was easing her jeans down over her hips, and tried to check out her backside over her shoulder, which had the effect of pushing her chest forward and making her impressive rack jut out even more.
"Oh my god, your tits are practically spilling out of this bra, girl," said Maya, taking the snap in her fingers and flicking it open. "Go ahead and get that off. Honey, you're gorgeous."
Jack was staring. He'd never quite realized how sexy Lori was in the couple of years they'd been friends. Her tits swung freely as Maya helped slip her bra off, large nipples growing hard and pebbly in the cool air. She stuck out her curvy behind and pulled the denim down over her ass, thumbs tucked into her panties as well, bending over as she pushed it all down her legs. The clothing caught around her ankles, so now she was fully naked, bent in half, using both hands to try to pull her foot out of her bunched up jeans and panties. Her ass shook and jiggled as she struggled. Jake realized his mouth was hanging open, as he took in the view of her ass and pussy, her big pink labia just as smooth and bare as Maya's.
"You guys are way too good looking to worry about clothes," he volunteered, watching Maya kneel down to help Lori get her feet out of her pants. "I mean, at least as far as I'm concerned you should both be naked all the time."
"I might like to take you up on that, Jack," said Maya, glancing up at him with a grin. "So far it feels great!"
"Oh yeah, that's real generous of you, buddy," Lori snickered. "But I think right now it's your turn."
He swallowed. "No big deal," he said, peeling off his t-shirt. Maya was standing beside Lori now, her hand resting on the other girl's lower back. Their hips were touching, their pussies just a few inches apart. Jack felt his cock growing at the sight of them. He quickly undid his belt and pushed his pants and underwear down together, feeling a cool rush as his cock dangled unencumbered, and began to swell and rise in little jumps.
Maya's hand went to her mouth. Her eyes were resting on his penis. The thought of her watching him that way made him grow harder, against his wishes. His cock felt thick and heavy now, pulsing up and down slightly every few seconds, standing nearly straight out. Lori giggled.
"I'm sorry-" he started.
"No, no," said Maya, "don't worry, Jack. It's only natural, isn't it?"
"Well, ah..."
"Of course it is. I think it would be a bit strange if you didn't get an erection in these circumstances, don't you, Lori?"
"I might be kind of pissed if he didn't, actually."
Jack grinned. It felt pretty nice to let his cock grow in front of them. He started to bend down to get his feet out of his bunched up pants, but Maya stopped him with a hand on his shoulder.
"Here, let me help," she said. She knelt down in front of him, and leaned forward to reach for his ankles. He felt her hair brush against the underside of his cock as she moved. It felt amazing. He stifled a little moan as she pulled his sneaker and clothing from one foot. She was just helping him like she did Lori, after all; it wasn't anything sexual. He was just glad to see she didn't mind being so close to his erection.