The Basement
The night at the hot springs buoyed their spirits the rest of the weekend. It was as if the world had become a little crisper, and a little brighter. Memories of their encounter flooded the gaps in their day, inspiring a persistent swelling and a slow burning urgency in their loins.
Alex excused himself from family breakfast to masturbate in the restroom, returning relaxed and clear eyed. He winked at Olivia across the table, and she grinned back knowingly. She showered after breakfast, enjoying a fast, sharp orgasm that only took the edge off the sexual tension welling up inside of her.
Their parents were in a surprisingly good mood. They even suggested a family hike - something they hadn't done in years. They packed lunch and set out along the long and winding trails through the woods, enjoying each other's company, chatting about college and the soon-to-be empty nest and all of the things that people can talk about when they're focused on the good things in their lives.
They returned in the afternoon, hot and sweaty and ready for a soak. The whole family stripped down and joined an older couple in one of the larger, cooler pools. Their afternoon experience in the spring was nothing like the intimacy of previous evening, but the twins couldn't help stealing glances and knowing looks at each other.
All in all, the trip was a rare success for the family. Despite their parents blow up on the first night, the rest of the stay was quite enjoyable - and the twins new found curiosity and excitement for each other was barely restrained.
All good things come to an end, of course. The five hour drive home grew tense as the evening grew longer. In the front seat, their mom and dad exchanged increasingly pointed comments about money and work and cleanliness. In the rear, the twins read to themselves, retreating to their inner fantasies, and blocking out the rest of the world.
It was dark when they arrived home, and the twins made themselves useful, unpacking the car as their parents poured drinks and raised their voices. Alex and Olivia excused themselves and went down to the basement.
Their room was tidy and reasonably sized, taking up the majority of the finished basement. The floor was covered with a tight brown Berber carpet, the concrete foundation walls painted a light yellow, and the space split with a curtain half way down the middle that afforded them each some privacy. Their beds were against opposite walls, which had been decorated with their own taste in posters and photos and memorabilia. Two mismatched bureaus sat next to the beds, and an old dinner table stacked with crafts and books sat in the common area at the end of the room. The walls was filled with shelving, containing more books and toys and bins and the paraphernalia of growing up.
It was a cozy room, all things considered. Just enough space for the two of them to have their own areas, and relatively quiet and cool thanks to the carpet, the dividing curtain, and the thick foundation walls. They could hear anyone walking above them, and the plumbing made gurgling noises when the toilets flushed, but all in all they had made it a nice place in the years they lived there.
Now, at the end of a long day, they put down their bags and looked at each other.
Alex smiled wearily. "I'm beat."
Olivia nodded. "Me too."
Alex looked at her for a moment, then stepped forward and wrapped his arms around her, squeezing her in a bear hug. Olivia let out a playful squeak and returned the hug, snuggling in against him.
He thought about her breasts pressing against his chest, and stroked her back affectionately, noticing her bra straps under her t-shirt. He was swelling inside his jeans, and felt a twinge of embarrassment about how quickly his body betrayed his thoughts.
She pushed her hips gently towards him, an affectionate warmth growing inside the pit of her stomach. He smelled good - warm and familiar and a little sour with sweat. She wiggled against him playfully, gave him a final squeeze and pulled back.
Olivia grinned at her brother. "You really are always horny, aren't you?"
He nodded, feeling the blood rushing into his cheeks. "It's kind of ridiculous, mostly embarrassing, and now ... extra weird because you're my sister." He shrugged apologetically.
She laughed. "Alex, I've been thinking all day about what happened last night. Watching you jerk off was really cool, and a huge turn on. I'm ok with it."
"Yeah," he nodded enthusiastically. "Watching you was amazing. " He grinned widely. "If you're ever curious about anything, I am totally happy to show you. And unless you say otherwise, I'm going be a lot less modest here in our room."
"Same," she replied, smiling openly. She bit her lip, pausing for a moment. "Seriously though, if this is going to be a thing ... we have to be really, super honest with each other. If it starts getting too weird or complicated or isn't fun anymore ... we have to stop."
He nodded. "I promise that if you say stop, I'll stop. I promise that if I'm too uncomfortable, I'll say so. I don't want to hurt you, or us."
"Me too," she said softly, stepping forward and wrapping her arms around him again. She hugged him fiercely, sighing deeply as he returned the embrace.
"So," he said hesitantly. "for the sake of total honesty, I have to admit something."
"What?"
"Well," he began, "I ... ah ... sometimes I steal a pair of your panties before I jerk off in the bathroom. Sorry."
"DUDE, I KNOW." She laughed and pulled away from him. "I mean, I do my own laundry and I know what I wear. I also know how dirty I make my underwear." She smirked and narrowed her eyes. "I'm just glad it was you, and not dad." She grimaced and stuck out her tongue in exaggerated disgust.
He grinned. "So, can I keep borrowing them?"
Olivia narrowed her eyes thoughtfully. "You can jerk off into my panties if you want, just ask first, alright?"
Alex laughed. "I accept your conditions."
They looked at each other for a moment, grinning. Alex's erection was becoming more noticeable in his jeans, and he shifted his hips in a vain attempt to relieve the discomfort.
She flashed a teasing smile at him. "So, do you want to jerk off into the panties I'm wearing?"
His eyebrows shot up and he nodded enthusiastically.
Without hesitation she unbuttoned her jeans, hooked her thumbs under the waistband, and shimmied them down over her hips - her black cotton panties coming with them. She did a little wiggle and they dropped to the floor. She stepped to the side, bent over, and picked up the panties with a hooked finger, dangling them them in front of Alex.
His eyes darted between the panties, her pubic hair, and her smiling face before he plucked the panties from her hand. They were still warm to the touch. He rubbed the soft layered fabric of the crotch between his fingers, and quickly brought it to his nose, inhaling the warm, musky scent of her sweat and ... that special something else, distinct and feminine.
Olivia watched his every move, amused by his enthusiasm for something so ordinary. They weren't sexy underwear or anything like that, and she'd been wearing them all day. She grinned about his obvious delight over something so simple.
Alex was so hard he was on the verge of pain. He frantically took off his jeans, nearly falling over as one the legs went inside out. His cock was free, bobbing in the air, and he gave it some soothing strokes after regaining his balance.
"Come over here," Olivia said, beckoning him toward her half of the room. She led the way, and sat down on her bed before she pulled her shirt over her head, revealing her simple, white bra. "Come here, I want see up close!"
Alex didn't object. He strode over in quick steps, dragging his jeans behind him, still inside out and attached to one of his ankles. He was grinning and looking down at his sister as he held the panties to his nose again, his other hand squeezing and stroking his erection.
Olivia's eyes were locked onto the penis bobbing a foot away from her face. She watched for a moment, then unhooked her bra and pulled it off her shoulders and over her bare arms. She sat on the bed, naked, her eyes wide and focused on her brother's cock.
"I've never been this close to a penis," she said with quiet enthusiasm, looking up at Alex with a big grin on her face. "It's not like porn at all, this is really cool." Her eyes returned to his cock, studying every detail as his hand pumped faster. She caught a whiff of his scent and sniffed sharply, savoring it.
Her enthusiasm and appreciation was a huge turn on for Alex. He felt the orgasm building almost immediately, and brought the panties down, fumbling a bit to position them to catch his cum.
She reached up and gently touched his thigh, feeling his muscles tense beneath his skin.
"Oh God," he grunted.
She watched his entire body go rigid, raising up on the balls of his feet as he emptied himself into the crotch of her panties. She was so close she could hear the cum squirt into the fabric, the thick fluid sprayed in lines as his muscles throbbed - some of it missing her panties all together and falling into the carpet on the floor.
