Try it on your older sis.

You get off the couch and clamber up the stairs to the room of your older sister, Marilyn. You open the door to see her gabbing into her cellular device, in a fitting tanktop and tight cotton shorts, brushing her hazel hair over her shoulder.

"Hey Marilyn," you say. She moves her head to face you, currently lying on her stomach over the bed, talking on the phone.

"Excuse me little brother." She places her hand over the receiver. As her legs move a bit too her ass flexes a little. "But I'm talking over here?"

You ogle her tight butt, one you've fantasized for years, and make a silent wish.

Start doing some stretches.

Your sister nonchalantly pushes her self up on the bed and goes on all fours. Then she curves her back a bit, showing off her tightly covered ass. With a glance back she flexes both cheeks, clenching then letting go and repeat. After this she begins a snake-like hump, elegantly thrusting her hips forward above the bed and then back as her body flows perfectly with her, her upper torso curving out and then in as her pelvis sensually grinds the air.

"What are you doing?" you ask.

"I'm stretching." She stops and gives you a puzzled look. "And why are you looking at me like that?"

"Sorry," you say, then silently think to yourself.

Take off your shorts and give them to me.

Without a word, Marilyn looks back and takes her hands and slides her shorts over her smooth, firm legs, then sits up. "Before you go, can you... put this somewhere." With a light throw, she tosses them at you. You feel them through your fingers. They are warm.

"Where do you want me to put these?" you hold up the shorts by your face.

"I don't know, just take 'em," she says in a couldn't-care-less tone, as you come up with another thought. "...and sniff them, so you can take in my scent. And get a whiff of my nice ass."

"Like this?" You smother your face with her shorts. She glances at you as you rub her shorts across your nose and deeply inhale.

"Yeah, exactly," she says.

"Got it. Thanks sis."

"For what?" she asks curiously.

"I don't know, it just came out. Sorry." With her shorts in your hand you head downstairs, where you hear sounds in the kitchen, the result of your stacked step-mom probably in the middle of some cooking.