Arriving home after a long day at school, Matt is free do do whatever he wants. His parents are out working, his sister is at some kind of club meeting at school and his older brother is hanging out at his friends house. Thinking on what to do, he could hook his game up to the TV in the living room, he could listen to music without his headphones, or he could sneak into his sister's room and have some devious fun. That last one was the thing he was most interested in.

Entering his sister's room was like walking out of a black and white movie right into a children's cartoon. Unlike the rest of the house, the room was painted pastel pink, although recently she's been saying that she's "too old" for such a brightly colored room. Looking around at the clean, but slightly cluttered room Matt finds what he's looking for. The mesh laundry basket that his sister keeps her dirty clothes. Walking over, he starts shuffling through her discarded clothes, searching for his prize, two prizes even. He collects two pairs of white panties and sits on the side of her bed. He pulls his pants and underwear down, his penis is already peeking out of his sheath in anticipation of what's to come. Holding one pair of panties to his nose and rubbing his cock with the other, moistening it with pre-cum.

Sarah's club meeting was cancelled last minute,actually they cancelled a while after everyone showed up. She arrived home about fifteen minutes after Matt did, and naturally she headed straight for her room. That's when she noticed her door was open a crack, and she could hear noises from inside. Silently creeping to the ajar door, she peered through the opening. She saw her brother masturbating using her panties. Swinging the door open, she says "What the fuck are you doing?" 
"Oh shit! Uhh! It's not what it looks like!" Matt yells, jumping out of his skin and off the bed. 
"Get the fuck out of my room, you creep!" 
After pulling his pants up and walking out of the room Matt turns around and pleads, "Please don't tell mom or dad, I'll do any-" he's cut off by his sister slamming the door in his face.

Devastated, nervous and tired, Matt decided that it would be best to take a nap. Laying down on his bed, he stares at the ceiling until he fades into unconsciousness. Sarah picks up the pair of underwear her brother was sniffing so intently and puts it back where it belongs. Picking up the next pair she's hit with an intoxicating aroma she had never smelled before. The smell of the still wet pre-cum made a switch flip in Sarah's brain. She felt an itch between her legs, one she needed to scratch. Sitting on the side of her bed she lifts her skirt and rubs her panties, stimulating herself. She brings her recently defiled panties closer to her nose and breaths deep, savouring the scent. Relocating her fingers into her underwear she begins rubbing in earnest, sliding a finger into her wet folds. Taking one final, deep breath, she plummets over the edge. Her orgasm rocks through her body and she falls into her back to enjoy the afterglow.

Hours after his awkward interruption, Matt tip-toes out of his bedroom and down the stairs, hoping to avoid his sister on his trip to get a glass of water. He succeeds in getting his beverage, but making his way upstairs he's stopped at his door. "Hey, what do you think you're doing?" Matt slowly turns around, avoiding looking at his sister. "Walking past my room without even saying hello." Matt is caught off guard, why is she acting like he wasn't caught polishing his dick with her panties. 
"Wait, what?" He says with a confused look. 
"I said, why are you avoiding me? Was it because you thought I'd be mad?" Sarah said with a smirk. 
"Yeah, I guess. So you aren't mad?" He said, hope in his voice. 
"Of course I was. At least until I thought about what you said, how you'll do anything as long as I don't tell mom and dad." She said, a devious grin spreading across her face. 
"How about you let me play your videogames whenever I want." 
"That's it? Okay, sure." The boy said. 
"For now at least." 
The fox girl spun around and began walking away, stopping at a shirt and bending down, pulling her skirt up her thighs and flashing her underwear at her brother. Dazed, the boy is hit in the face with the discarded shirt. 
"Stop leaving clothes in the hallway, idiot." Sarah said before returning to her room.

The rest of the family soon arrived home. The first to arrive was a grey fox named Mary, the mother of the three children. David and Jacob arrived together. David had picked Jacob up from his friends house after work. Jacob had gray fur, similar to his mother, whilst both Sarah and Matt had orange fur that was comparable to their father's coat. Once everyone had arrived home Mary and Jacob started to make dinner.

"So how was everyone's day?" Mary asked as everyone sat down and put food on their plates.
"Mine was great, sold a lot of stock today." David exclaimed between bites.
"My club meeting was cancelled today. But that's alright, I got plenty of time to play with Matt. He even said I can play on his console anytime I want!" Sarah said excitedly.
"Really? Is that true Matty?" David asked.
"Uhh, yeah I gue-" Matt felt something creep it's way up his leg and on top of his thigh. His sister had reached her foot under the table and was rubbing what seemed to be his entire lower half, the unexpected physical touch causing a tent to form in his pants.
"Ahem, yeah I did say that..." The boy croaked out whilst trying not to cause suspicion.
"Well that's very kind of you. What about you Jacob? How was you're day?" Mary said.
"Alright I guess." Jacob said, not taking his eyes off his food. Mary looked over at Matt and he seemed out of sorts, he was panting hard and his face seemed flush.
"Are you okay sweetie?" She asked, worried he might be sick.
"I uhh, could I, mmm, maybe go eat, ahh, in my room?" Matt asked. Sarah had not stopped teasing her brother, moving ever so slightly closer to him to be able to reach his crotch with her foot.
"Sure sweetie, I hope you aren't sick."
"No, I think I'm fine it's just a little, ah, hot in here." Matt climbed out of his seat, picked up his plate and turned around quickly in an attempt to hide his erection. Only a few minutes later Sarah finished her plate of food. 
"Maybe I should go check on him, see if he is sick." Sarah said.
"Okay, sounds good." Mary responded.

Creeping upstairs and up to her brothers door, Sarah heard a familiar sound. He was already jerking off. Swinging the door open and shut in a matter of seconds she was inside his room.
"Whoa, hey what the hell?" Matt said in a hushed but urgent tone, covering his cock with a pillow.
"What? I figured I'd come up here and "make sure you're okay". I thought it was a nice thing to do." Sarah said with that same grin from earlier. She sits down next to him she instructs him to remove the pillow. He begrudgingly does so.
"Wow, it looks even better without my panties on it." She reaches down and caresses the top of his member with one finger. Matt let out a weak moan at the first touch, and every time she moved her dexterous finger up or down.
"It's so warm, maybe you are sick." The fox girl said in a playful tone. Finally using more of her hand, she strokes Matt's cock with increasing gusto.
"Ahh, I'm gonna, I'm gonna-" Matt says, nearing climax. But the pleasure stops just then.
Pulling down her panties and lifting her skirt, "Ladies first." She says that same grin on her face.
"Wait, really?" Matt asked worried this is some kind of trap.
"It's the least you could do. I jack you off, you help me get off too. I'll even let you lick it, if you want." Not saying anything in response, Matt gets on his knees between his sister's legs and starts rubbing her pussy with his index and middle finger. Easing a finger or two in every now and again she was rather impressed at how good he was. She was moist when he started, but two minutes in she was soaked. After thoroughly using his hands he moved one to her thigh and the other behind her back, at the base of her shaking tail. He dove in, nose first. He began licking between her wet folds.
"Ahh! Wow, okay. Mmmf." Sarah moaned while still trying to stay quiet. Happily lapping away and feeling the soft fur of his sister's thighs kept Matt's cock at full mast. The scent from his sister's pussy certainly helped as well.
"Oh God, ahh!" sweet moans emanated from the fox girl as she was aproaching her crascendo.
"Mmmf, I-I'm nearly there!" Matt kept at it, licking up and down her soaking wet slit. It hit her hard. Gripping on to her brothers head and moaning, Sarah cums. Matt keeps licking for a few moments, keeping Sarah in her state of ecstacy. After a while Sarah's grip loosens and Matt returns to his spot on the bed.
"Well, my turn." He says, pointing to his still rock hard member.
"Oh, I'm sorry, Mr. Impatient" Sarah says, leaning over and grasping onto the base of Matt's member.
"You ready?" Asks the fox girl. Matt nods in response. Sarah takes a tentative lick at the pre-cum coated tip. Matt moans and almost cums at the first touch, but he manages to hold it in. Opening her maw, Sarah eases her wet mouth over the tip of his cock, licking it as she goes down on her brother. Slurping up and down on his salty dick forced Sarah to breath through her nose, she smelled that familiar musky scent. Although it was fifteen times better straight from the source.
"Oh fuck, I'm gonna-" The boy says seconds before his cock erupts. He sprays his ivory load right into his sister's unprepared mouth. He presses one hand on the back of her head, keeping her snout lodged on the tip of his member until his climax fades. After her head is let go, Sarah pulls her head away from the quickly shrinking phallus.
"Jeez, warn me earlier next time! And don't hold my head like that, I nearly choked." Sarah reprimanded the boy.
"Sorry, it just felt so good." Matt said, eyes looking down to the floor.
"It's okay, I mean... It was kinda hot... I guess." Sarah pulled her panties up and turned to leave.
"Wait, so... Are we going to do this again?" Matt asked.
Sarah turned back, "Maybe if I feel like it. In-between me playing your videogames." She said with a wink. Opening the door and leaving, Matt was left alone. Alone but satisfied, and excited for what's to come.