Sunbathing Melanie

You look back outside at your stacked sister, Melanie, and her enormously tempting fun-bags.
"Oh yeah, I gotta play with those babies, right now!"

You make your way to the back door and head into the backyard. Melanie seems to be asleep in the lawn chair, taking in the sun. You approach her like a predator stalking its prey and lick your lips at the sight of those amazing tits. You stand over her for a second and stroke yourself to a full erection.
"Beautiful."

You reach down and grab the front of her bikini top, gently untying it while she sleeps. You pull it completely off and expose her marvelous melons. Not being able to hold back anymore, you straddle the lawn chair and reach down and grab your sister's breasts.

Melanie jumps awake at your touch.
"Jesus, bro, you scared the shit out me!"
You continue playing with her naked breasts, rolling her nipples in your fingers.
"Fuck, David, what are you doing? Hmmm, actually that feels good."
You gently pull on her nipples and then lower your head. You take her left breast in your mouth and suck hard on it. Melanie, surprisingly, grabs the back of your head and pushes you into her chest. You suck hard and pull your head back until her nipple pops out of your mouth with an audible POP. Then you dive into her right breast and repeat your actions.
"God damn, sis, I need to fuck these puppies!"

You stand up and line up your dick between her breasts.
"Hey sis, mind giving me some lube?"
She doesn't understand right away but then you lean forward and thrust your cock into her face. She gets the hint and opens her mouth. You brace yourself with one hand on the back of the chair and use the other to guide her mouth on your cock.
"That's it, get it nice and wet."
She slathers your cock with her tongue in her mouth. You start thrusting to meet her sucks and soon your cock it nice and lubed up.
"Thanks babe, now for some titty-fucking!"

You stab your cock between her breasts and start thrusting into her cleavage.
"Awwwww, yeaaah. Sis, grab your tits and mash them together for me."
She does so, a little reluctantly. You just thrusting harder and faster. Each time you do, your cock head pokes out the top of her breasts and bumps into her chin.
"Oh yeah, stick your tongue out now!"
She scowls up at you, but flicks her tongue out and licks your head on each of your thrusts.
"Yeah, yeah, that's it. Work for that cum, bitch!"

Finally, you've had your fill of her glorious melons and line your dick back up with her mouth.
"Suck it."
Your sister leans forward a bit and takes the head of your cock in her mouth. She starts to slowly bob back and forth, taking a little bit more of your cock each time. The whole time, she is running her tongue along the underside of your cock.
"Go deeper."
She glances up at you and shakes her head.
"That wasn't a request. That was a demand."
You grab the back of her head and **** her further down your cock. She winces as it hits the back of her mouth. Luckily, for her, her hand is around the base of your dick, preventing you from going any further.

"Move your hand."
With her eyes still squeezed shut and your cock halfway in her mouth, she shakes her head again.
"I said, move your hand."
You grab her wrist and fling her hand off your cock. As soon as you do, you push hard on the back of her head and slip into her throat. She convulses and chokes on your dick.
"Yeah, that's it. Deepthroat it, babe."
She puts both hands on your thighs and tries to push you off. You laugh at her feeble attempt and drive her back into the lawn chair. Now, with your full weight on top of her, her head is trapped between your rock hard cock and the back of the chair. You start thrusting in and out of her mouth rapidly, spit flying out onto your stomach and balls.
"That's it, that's what I want, give me that throat!"

Tears are streaming down her face as you throatfuck the hell out of your older sister. You look down at her. This is a fantasy you've had since you were a teenager. Your hot, busty older sister **** on your cock. You lodged in her throat while she struggles against you to breathe.

The scene is too much for you and you feel your impeding orgasm building.
"Awwww yeah, bitch, here it comes!"