The blue, red, and white bunting flapped about in the slight breeze. I settled back admiring my handiwork and finished a Newcastle. I looked over at my sister, well, stepsister, Casey. She was in a very thin scrappy black bikini. The straps left very little to the imagination, and if my mom and step-dad were around, they would have demanded she wear something else. I was shocked she even owned one of those things. The material barely covered her 36C tits, which strained against the black thin straps. That was the intention, I guessed. Her long pink hair hung to her waist, with tendrils that drifted in the breeze. Why pink? She said she wanted "something different." I think it was to mess with her dad. They were off at some cabin in Arrowhead for the weekend, doing who knows what.
Casey was gorgeous and she knew it. She looked down at me and the erection that was trying to escape my swim trunks. "Having an issue, big brother?" She peeked over the tops of her designer sunglasses, her jade eyes dancing with mirth. She had turned 18 two weeks ago and was loving the attention she received.
Even from me.
I shook my head. "No, because you are gonna come over here and suck it." I smirked at her, knowing she wouldn't. We were tight for being step-siblings, joking easily with each other.
"Like you would even last," she said with a half-grin.
I glared at her for a heartbeat, then let her walk off. I smirked at her shapely backside as she turned around to walk away. She jiggled her ass a little while she walked off. God, I wanted to pound that ass, hard. She gave me one last smile as she walked into the house. I shook my head and looked out over the Pacific Ocean. My parent's place was right on the water of Hermosa Beach. Both neighbors were getting ready to celebrate the 4th of July, as were we. The issue was both Mom and my step-dad were gone for the whole weekend. It was just Casey and me. Well us, and a few of my friends. Her friends were supposed to come over, yet I doubted they would. And I was pretty sure Casey would just bail on the party and go find her boyfriend-du-jour to fuck.
I grabbed another beer from the big cooler and opened it by slamming the top off from the table nearby. The bottle opener was on the table at the end of the patio, and I was still a bit high. The last of the joint was gone before Casey had come out to bother me and show off her body. I slowly drank it and checked my cell to see if there was any news from my friends. Mike said, "Picking up the assholes." Which meant they were gonna be late, as usual. The only one responding was Mike, which meant Yitz and Myles were stoned and Mike was driving to them first, which was an hour away. So, I was going to be alone with Casey for at least two more hours.
"Well, fuck." I got up and tossed back the rest of the beer. I tossed the empty into the big plastic bin. Walking inside, I saw Casey crying on the couch. "What's wrong, boyfriend dump ya?"
She looked up at me, her face red from crying. "Fuck you, jerk." She tried to get up, but her feet got tangled up and she pitched forward. I lunged forward to grab her. We went down in a heap, her head coming to my chest. She burst into a bout of fresh tears, she blubbered something, and I wasn't sure what she said.
"Didn't catch that, Sis?"
"Men are jerks," she mumbled.
"Thanks. I could have let you fallen you know."
"It isn't that. I mean, thanks, Bro." She pushed herself up, sniffling. In the fall, the straps had shifted. When she stood up, the faint scent that wafted towards me caused my dick to harden. I licked my lips seeing her pussy exposed. I stared at it for a minute, amazed at the bald, juicy cleft. I licked my lips subconsciously.
"John. John!"
I looked up into Casey's eyes, still a little stunned at that the sight of my stepsister's pussy, and that I was so turned on by it. "Sorry Sis. I... I don't know what happened."
"Like what you see?" She asked, sniffling a little.
"Yeah!"
"Tough!" She took a perverse joy in the statement. She reached behind her and yanked off a blanket from the sofa to wrap around herself. She settled back on the couch, spreading her legs a little so I could catch sight of her shaved sex and then looked at her phone when it beeped. With a snarl, she cocked her hand back as though she was going to hurl it across the room.
"Seriously Kay, what is wrong?"
"Doug is 'too busy' to see me today." She turned away, grabbing her phone. "Just thinks I'm not good enough, I guess."
"What does that mean?" I pushed myself off the floor and got up closer to her. She pulled away and that hurt. I might have only been her stepbrother, but she always confided in me. "Talk to me, Sis."
She gave me a huff and pushed the phone into my hands. "See!"
I looked down at the cell in my hand, a new iPhone 7 On the screen was Jennifer Morsen, a freshman at UCLA, slurping at a dick that I assumed was Doug's, Casey's boyfriend--well, probably ex-boyfriend now. Jennifer's dark hair was held in one hand. I could see a few other guys standing around, naked. I flicked my thumb across the surface and saw another pic of Jenny sucking one of Doug's friends, while Doug was deep in her well-tanned ass.
"Wow, what a slut," I said. I kept flipping and was shocked when I found one of Casey, naked. Doug's dick was slapped on her face, plastered with cum. I looked up at Casey and she was crying. I felt myself getting harder as I kept flicking through pictures, selfies, some of her and Jennifer, her, her food, her again and found one of Casey, her pale ass in the picture, two dicks in her. One, in her pretty pink pussy and the other in her ass. I was shocked. Also very very turned on.
"Umm, Sis, what is going on with these pix?"
"Oh, those are other parties I've been to with Doug."
"Wait, you like to fuck multiple guys?"
"So?" She looked at me with a frown. "You think that's weird or something?"
"No, not at all. I think it is hot."
She smiled a little. "Thanks Bro," she said, taking her phone back and scrolled through the photos until she was looking at the ones that Doug had sent. Then she looked at me with red rimmed eyes, then down to the bulge in my shorts. "Enjoy what you saw there?"
"Maybe," I said with a stupid grin on my face.
One of her hands dropped to my crotch and started to stroke it. She gasped a little when I grabbed myself, and she could feel how big it was. "Looks like that is a 'yes' to me."
"And now Doug is fucking some other slut," she said. "I think that means I'm free to fuck whoever."
I looked at her. An idea starting to bloom. "You know, I have some friends showing up."
She looked at me and shook her head. Her hand pulled away from the bulge. "No. You're my brother..."
"Step-brother."
"Why would I want to fuck you?" She asked, eyebrow cocked.
I pointed to her phone. "Either you let me and my friends fuck you, or I tell Mom and Dad about these pix. And about what you do with Doug."
She glared at me for a minute. "You wouldn't dare." Yet, I could see her grinding her thighs together.
I pulled it out and she licked her lips. "Plus, I think you want to feel this big guy inside you." Judging from the pictures with Doug, I was two inches longer and thicker around.
