*astolfo your roommate caught you masturbating *

"I-I'm sorry! I didn't mean to interrupt anything important!" you stammer, looking back and forth between your phone screen and the person who spoke up. It's Lune, your roommate for the summer. You hadn't seen her in a while; she'd been working at the library all day. "I was just... um..."

Her expression softens slightly, and she sits down on the bed next to you. "You were masturbating," she says matter-of-factly.

"It's okay," Lune replies, putting a reassuring hand on your shoulder. "You don't have to be embarrassed around me." She pauses for a moment, then asks, "Can I... see?"

You swallow hard, feeling a mix of shame and arousal. You're not sure if you should show her or not, but something about her calm demeanor makes it easier to consider.

Lune's eyes widen slightly at the sight of your cock. "That's... not very big," she comments gently. You flush even deeper red and hide your face in your hands. She reaches over, lifting your chin so that you have to look at her. "Hey, it's okay," she says softly. "It's natural for guys to come in all different sizes."

You feel a little bit better hearing that, but you still can't help feeling self-conscious about it.

After a moment of silence, Lune asks, "Do you want to see mine?" You blink in surprise, looking at her curiously. She nods, unzipping her shorts and pulling them down just enough to reveal her underwear-clad crotch. "I'm not as big as some guys, but..." she trails off, letting you draw your own conclusions.

You feel a stirring in your pants again at the sight of her bare skin and the outline of her cock beneath her fabric.

Lune smirks slightly, clearly enjoying the attention. "About five inches," she says casually, holding her thumb and forefinger about an inch apart to illustrate her point. You can't help but feel a pang of envy at the size she's describing.

"Would you like me to show you more?" she asks softly, her voice low and sultry now. You nod eagerly, your cock already starting to harden at the thought of seeing her exposed further.

Lune slips off her underwear and pants, revealing her smooth, hairless mound to you. Her cock stands proudly upright, curving slightly to the left as it juts out from her body. It's even bigger than you thought - at least six inches long, if not more. You can feel your mouth going dry and your heartbeat quickening in anticipation.

She reaches down, taking her cock in one hand and guiding it up to eye level for you to see. "Like what you see?"

Chuckling softly, Lune obliges, moving closer so that your hard cocks are almost touching. She lines them up side by side, marveling at the contrast between her long, thick shaft and your smaller but more delicate-looking member. "See?" she says with a grin. "Not all guys are built the same."

You look down at your cocks together, feeling a strange mix of pride in what you have and envy for hers.

Lune continues to stroke both your cocks as she compares them, marveling at the differences in size and shape. "Your cock is shorter and thinner," she says, running her fingers over the head of yours, "but it's very smooth and sensitive-looking." She then moves down to hers, fondling the thick shaft gently as she speaks. "Whereas mine is longer and thicker, but maybe not quite as delicate."

Lune helps you position your cocks so that their bases are level with each other. As she does this, your smaller cock almost seems to disappear next to hers. "If we're measuring from the base," she says, looking thoughtful, "your tip would be about... here." She reaches down and guides your hand to where her hand is now, roughly indicating a spot just below your navel. "Not bad for someone with a shorter cock!"

Lune grins at you impishly. "Well, I'm taller than you," she says with a wink, "so if we were measuring from the same spot on my body... my tip would be about here." She moves her hand down lower on her stomach, stopping just above her pubic bone. Her cock easily reaches twice as far as yours did when she used your own navel as a reference point.

"See?" she asks teasingly. "Big differences, huh?"

With a laugh, Lune obliges once more. She cups her hand under each of your balls, feeling their weight and size. "Your balls are smaller," she comments, "but they feel nice and firm." Then she moves down to fondle hers, running her fingers over the smooth skin and squeezing gently. "My balls are larger and hang lower," she continues, "but yours are more compact and tucked in closer."

Lune looks at your balls and her own for a moment before speaking. "Your balls are maybe about half the size of mine," she says, cupping one hand around each set. "And they're higher up on your body, closer to your stomach." She moves her hands lower on her own body, letting you see how much more room there is between her legs for her larger testicles.

"It's interesting," she muses, "how different guys can be in so many ways down here."

"Hmm... well," Lune says thoughtfully, tracing her fingers along the veins that run alongside your shaft, "we could compare sensitivity..." She does the same to herself, feeling how responsive her skin is to her touch. "Or maybe stamina..." She continues stroking both of you, watching carefully for any signs of tiredness or diminishing arousal.

As she explores these differences between your bodies, she can't help but feel a growing sense of admiration and respect for the variety of human experience.

Lune gasps softly as she feels your warm fluid coat the head of her cock. "Oh...!" she exclaims, feeling a sudden surge of arousal course through her body. She looks down at you with eyes wide and blissful, clearly enjoying the intimate contact.

"My turn," she whispers, gently pushing your hand away from your cock. Her other hand slides up and down her shaft rapidly, bringing her closer and closer to orgasm. "Oh fuck..."

Lune gasps, arching her back as she feels the familiar tightening in her abdomen. With a loud moan, she comes, squirting long strands of thick cum onto your cock and stomach. Her body shudders with pleasure as she releases herself into the moment.

When it's finally over, she falls back onto the bed, panting heavily. "Wow," she says, looking down at her covered-in-cum body. "That was... intense."

Lune looks up at you with a mix of gratitude and amusement in her eyes. "I think... my cum might be thicker than yours?" she says tentatively, watching as your cock twitches slightly under the weight of her ejaculate. "It definitely shoots farther." She grins sheepishly, clearly pleased with herself but also a little embarrassed by how much she just came.

"Hmm..." Lune hums, considering the question carefully. "I think... mine was more powerful?" she suggests after a moment. "Like it came from deeper inside me, and just sort of exploded out." She shrugs, smiling down at your cock. "But yours might be more... varied in intensity? Like you could probably have little squirts like that over a longer period of time."

She looks up at you again, feeling a sudden surge of affection for her roommate. "