More Melanie

Since there's no immediate sign of Rachel or Claire, you decide to head back out to Mel in the backyard. She's still laying in the lawn chair, right where you left her. Your older sister is still a complete mess, hair disheveled, bits of spit and cum all over her face and tits.

"Hey, sweet tits, I'm back!"
Mel doesn't really respond. You hear her murmur something and shift about in the chair. She seems pretty out of it after your last session with her. You walk over to the chair and straddle her face again.
"Hey! I said wake up!"
You slap her lips with your hard cock again. Her eyes inch open a bit but she's still pretty dazed. She tries, weakly, to bat you away with her limp arms. You reach down with one hand, grab her hair and tilt her head back.
"Heh, not much fight left in you, eh? Open wide!"
You reach down with your other hand and pry her mouth open. You look down at her wide open mouth and stick two of your fingers in. Reflexively, she closes her mouth around them and starts sucking.
"See, that's a good girl, you know just what to do."
You start pushing your fingers deeper into her mouth until you can feel the back of her throat. She coughs a bit and her brow furrows but she doesn't make any other move to stop you.
"That's it, open your throat for me."
You push all the way in with your fingers and you can feel the inside of her throat now. She winces at the intrusion and tries to squirm away. You can feel her throat muscles trying to expel your fingers but you hold strong on her head.
"Time to put something else in there."

You remove your fingers and line up your dick with her mouth. It only takes a little pressure to nudge past her lips and into her warm, waiting mouth again. With a firm grip on her head, you begin bucking your hips into her face. You push a little harder and slip into her tight throat once more.
"I love this mouth. But you know what sis? I'm in the mood for something else."
With that, you pull out of her mouth and move down to her waist. You rip off her bikini bottoms and salivate at the sight of her shaved pussy.
"Oh yeah, gonna get me some of that."
You reach down and pick up her legs, putting them on your shoulders. Then you lean between her legs and take a sniff of her sweet pussy.
"Lovely."
You use one hand to steady yourself and the other to insert two fingers into her vag. She coos at your touch and her hands move up to your head. You lean in a bit further and flick her clit with your tongue. Melanie jumps at this and grabs a handful of your hair, pushing your head into her hot box. You start sucking on her clit hard while continue to thrust two fingers into her pussy. Your older sister's legs wrap around your head and pull you in even more. After a few minutes, you push yourself off her and back up.
"You taste great, sis."

With her legs still on your shoulders, you line up your raging prick with her wet pussy. You take a moment to tease her clit with the head of your dick and then thrust yourself into her cunt to the hilt. She throws her head back in the chair and screams beneath you. Her hands move up and grab onto your arms and you start plowing away.
"Yeah, that's it, take my cock, take it!"
You pull almost all the way out and slam back in. Each time, her tits bounce up into her face and she moans loudly. You do this over and over, slowly picking up a faster, steady rhythm. You grab both her ankles and slowly spread her legs further apart. You can now look down and see yourself pumping in and out of her pussy.
"Play with your clit, sis. Cum on my cock."
In a haze, she slowly reaches down between her thighs and starts rubbing her clit. Her moans become deeper and faster. You keep pumping her, slapping her ass with your balls on each thrust. You slam in all the way, and slowly rock your hips, fucking her as deep as you can. Just then, she explodes in an orgasm and thrashes beneath you. This is all too much for you to take and you know you are about to cum.