“Fwahhh... holy fuck it's hot outside.”

Maddie steps inside the nicely air-conditioned house, stretching after walking home from a long day of work. Her sister Jess, sitting on the couch across the room, looks up from her phone.

“Supposed to be pretty warm this week,” Jess replies. “Maybe you should look at getting a ride home for a few days? Would hate for you to get heat stroke, y'know.”

Jess subtly eyes up her older sister's figure: the sweat glistening on her chubby belly and thighs, the plump pair of cheeks just barely fitting inside those shorts, and that thick bulge between her legs with a foreskin-covered tip just barely peeking out the waistband. It doesn't take much to make Jess blush, even less so for her own sister.

Maddie grabs her water bottle, talking over to the couch, and sits next to Jess before taking a big gulp of her water.
“What've you been up to today, eh?“ Maddie asks before taking another swig of her water. ”Nothing too crazy, just cleaning a bit around the house and figuring out what groceries we need,” Jess responds.

The heat from Maddie's body and the feeling of her sweaty body touching her own gets Jess slightly flustered. She's always struggled to hide her romantic (and admittedly lustful) feelings for her sister, but times like this Jess wishes it were just out in the open. Just imagining everything they would do to each other is enough to make her red as a beet.

“Hey, you doing okay?” Maddie asks concerningly.

“H-Huh? Wha-” Jess is jerked out from her deepest thoughts, slightly startled. “Oh y-yeah! I just feel a bit warm is all, m-maybe I should go stand in front of th-”

Maddie, without hesitation, dumps some of her water on Jess's head, practically making her jump out of her seat from the unexpected shower.

”AH! Wh- why'dja do that?!“ Jess asks, now halfway soaked from her head to her belly.

”Well, you said you were warm, so I did you a favor, you dork!“ Maddie giggles. ”Here, just so we're even...“

Maddie pours the rest of the bottle on herself, drenching herself even more than Jess, and even moreso than with her own sweat. Jess blushes as she once again eyes up the gray mouse, the soft pink areolas and nipples now easily visible through the wet fabric of her top.

Maddie ruffles her little sister's hair as she gets up. ”Alright, I'm gonna grab a shower, I feel gross from the heat,” she says, pulling her soaked top off and tugging her shorts and underwear off, now exposing her cock in full to the other mouse. ”Here, toss these in the laundry, would'ja?“

She tosses her clothes to her sister, who's too busy trying not to seem obvious as she gawks at her sister's member, resulting in Jess getting a face full of Maddie's wet garments. Jess gives a thumbs up as Maddie walks away, every pudgy bit of her body giving a hefty bounce as she walks upstairs.

Jess waits to make absolutely sure Maddie is out of sight before taking a deep breath with her face buried in Maddie clothes, trying to get every ounce of her sister's musk in her nose. She holds it for a moment before letting it out, panting, but lusting for more.

She heads upstairs with an erection in her own clothes that was practically begging to be seen. Jess passes the bathroom door, cracked open usually to let the steam out when the shower's running. She pauses for a moment and peeps in the crack, spying Maddie inside the room.

Jess gets an eye full of her sister's features. She fixates on Maddie's cock, now standing at half-mast and idly throbbing, the foreskin just barely wrapping around the pink glans. She drools as she stares through the crack at Maddie, Jess's own erection being subconsciously touched and toyed with as she watches behind the door.

For a brief moment, she appears to be caught by her older sister, vaguely exchanging eye contact before Jess quickly pulls away from the door and heads down the hall to the laundry closet.

But Jess doesn't stop at the closet. She keeps going. Past her mom's room, past Maddie's room. She opens the door to her room, Maddie's musky clothing still in hand. Tossing the garments onto the bed and locking her door, Jess immediately strips her bottoms off. Her own cock bouncing out of their prison, slightly leaking precum from her idle touching a moment ago.

Jess's heart pounds like nothing else. The mix of seeing her sister's sweaty body, the rush of possibly being caught spying on her, and the repressed guilt of stealing her clothes to breath in more of her sister's scent all toiled in her mind.

She walks to the bed, laying down as she pulls Maddie's underwear to her face, breathing in as much of her sister's musk as possible. The scent gives Jess rush after rush of arousal. The mere thought of her own sister wearing these panties all day, getting all bunched up in between her fat ass cheeks, soaking up the sweat from her balls and the occasional drippings of precum from her glans; it was like nothing else she could think of.

Jess continues to press Maddie's panties against her face, stroking her own girlcock with vigor and desperation for release. It doesn't take long before she tenses up, failing to hold in a needy squeak or two, and shoots several ropes of cum across herself and Maddie's clothing. She bucks her hips softly as she grips the bedsheet. Her toes curl, her sudden twitches and heavy panting all but ease as she rides out her orgasm; but the scent propels her arousal forward.

She wants more, she wishes her lungs were capable of breathing in any deeper than they already can. She wishes she could do nothing but breath Maddie's musk and sweat. The only thing that would be better is to have Maddie sit directly on her face, allowing her to take it all in directly from the source. Jess continues rubbing and stroking her shaft while desperately taking deep breaths of her sister's smell...

Before long, Jess loses track of time. At this point, she's only able to make her fluids dribble out of her tip, no longer shooting out as far up her body as it did the first time... or the second or third time. By now, her own body is slick with her juices. Her top is visibly wet with semen, as her own pudgy belly is glossy and white, some of her cum pooling in her belly button.

*knock knock*

"Jess?" says a muffled voice through the door.

Jess immediately sits up, her sister's clothing thoroughly soaked in Jess's fluids. Before she even gets a chance to get off the bed, the door swings open slowly.

“Hey, I've been calling you for a couple minutes now! I needed a towel...”
Maddie stands in the doorway, dripping from the shower.
Her arms folded, her foot tapping against the hardwood floor. An annoyed look towards Jess that soon turns to confusion, then becomes a smug grin from ear to ear.

“Well well well...”

“What do we have here, little sister?~”

Jess' face turns a bright red, embarassed while also unsure of what to do. She trembles and tries to cover herself up, but to little avail. Maddie walks inside the room, shutting and locking the door behind her. She steps over in front of Jess, practically towering over the seated, startled mouse. Maddie gently picks up the soiled pair of panties draped over Jess's nose.

”Y'know... you could've just asked for these~“ Maddie teases.

Jess looks up, slightly taken aback at the fact her sister isn’t mad, but seems… excited to find her like this?

“Trust me, lil sis, you're terrible at being subtle... and at peeping into the bathroom without getting caught~”