Cucked by my Sister

[WP] She loves watching her girlfriend do it with other girls. She didn't expect today's girl to be her own sister, though.
From u/DinoProGames

“You want to see other people?” she asked, a look of concern on her face.

“No, no, no. I want to watch you with other people,” I corrected.

She still looked confused, “Like who?” She sat up in our bed, and I followed suit.

“Anybody. Maybe we meet someone at the club, and we invite them back here, I’ll sit over there and watch the two of you,” I said, brushing my thumb against her cheek. “Or maybe you meet a cute barista and surprise me.”

“What about people we know? Like what about your parent’s neighbor, the old guy who’s always watching us from the blinds?” she asked. “Or what about your 4th grade teacher, the one we ran into at Target?”

“Mrs. Holt?” I squirmed at the thought of my sexy girlfriend banging the sexy MILF. “Absolutely. As long as they know I’m going to watch, you can bring home anyone you want.” I leaned in kissing her, “Especially Mrs. Holt.”

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It had been 3 years since I had brought up the idea of Mary cucking me. Since then, it’s become a regular occurrence for Mary to bring someone home. She never managed to bag Mrs. Holt, but I was still holding out hope. One of her favorite things was to have me watch her blow guys in the bathroom when we go out dancing.

Mary said it was a lot easier to get guys to agree to allow her girlfriend to watch, but she always tried to bring back plenty of women too.

We sat next to each other watching the new episode of Grey’s Anatomy. “I’ve got something big planned for tomorrow,” Mary told me during the commercial break.

“Oh yeah? You finally get Mrs. Holt to come over?” I joked.

“Not quite, but I just need to double check, you really meant it when you said anybody, right?” she took my hand in hers.

“Yes,” I said, pulling her hand up to kiss it, “I thought that was clear when you screwed my boss. He still asks about when he can come over again.”

Mary laughed, “Maybe if he had lasted a little longer, he’d have been allowed an encore.”

“So who is it?” All the possibilities were racing through my mind. I definitely wouldn’t be able to focus on the rest of the episode. “Is it Patrice? You know I don’t like her.”

“I can’t say, it would ruin the surprise,” she grinned, knowing that the questions would drive me crazy.

“Ew, it’s not the homeless guy who always tries to look up our skirts,” I joked.

She looked around the room, refusing to answer. I shove her. “Okay no, it’s not that creep. At least not yet,” she stuck her tongue out. I tackled her, peppering her face in kisses. I would just have to wait to see what my beautiful girlfriend had planned.

————————————

The anticipation was killing me. Mary had refused to give even the slightest hint of who would be joining her in our bed tonight. We were just finishing dinner when the doorbell rang. Mary set her glass down, “That’s must be her.” Her, so it’s a woman. “Why don’t you head upstairs while I greet our guest?”

She gave me a kiss at the base of the stairs. I stared at the door, the mystery woman stood just on the other side. I could easily run over and check through the peephole. Instead I make my way upstairs, it wouldn’t be much longer before Mary and her made their way upstairs.

Our bed was neatly made, I walked around the room lighting the candles. With everything in place, I made a final trip to the bathroom before taking my seat. I patiently waited for the show to start. I could hear Mary’s laugh from downstairs, she was obviously quite friendly with whoever she had invited home tonight. So that ruled out Patrice, and confirmed that it wasn’t the upskirt pervert either.

I squirmed in my seat, resisting the urge to touch myself. I liked holding out as long as I could. I sat up straight in my special cuckquean chair when our bedroom door opened. Mary entered first pulling a cute little blonde behind her.

It took me a second to register who Mary had brought into our bedroom. It was Lana, my little sister. “Hey Val,” she said shyly waving.

Mary stared at me, waiting to see if I would use our safeword. I hadn’t ever needed it, but I was tempted. Could I really watch Mary fuck my little sister? I was about to find out.

“I thought it would be fun to try out the newer model,” Mary teased, grabbing Lana from behind. She kisses the crook of my sister’s neck, Lana whimpered from my girlfriend’s attention.

My sister stood in my room, staring at me as Mary’s hands roamed over her. She grabbed the hem of her shirt, pulling my sister’s top off. “Wow, would you look at these? How come you didn’t get a bigger pair?” Mary said, playing into the humiliation. Mary had mentioned Lana’s bust at several family get-togethers before this.

Mary whispered something to her. Lana then said, “Val, I’m glad you finally learned to share your toys.” I couldn’t help but laugh at that, Mary’s cheesy jokes sounded funny coming from my sister’s mouth.

Lana’s bra fell away as Mary unhooked it. “I knew it,” Mary said, she grabbed Lana’s tits. Her fingers playing with the tiny silver barbels sticking through my sister’s nipples, “I told you I saw them poking through her shirt that one day.” Lana blushed at Mary’s joy over confirming the piercings.

Mary whispered to her again, Lana relaying the message, “Maybe if you had your own piercings, your girlfriend would be fucking you instead of me tonight.” Mary was already working on unbuckling Lana’s pants.

I gripped the arms of the chair, Mary’s hands teasing my sibling’s body as I watched. The final article of clothing dropped around her ankles, leaving Lana naked in my bedroom. “What do you think? Doesn’t your sister have such a pretty little pussy?”

“So pretty,” I agreed, watching Mary’s fingers spreading her folds.

Mary pushed on Lana’s shoulders, guiding her to her knees. She pulled her arms free of her dress, the article pooled on the floor revealing my girlfriend’s distinct lack of underwear. The urge to masturbate grew as I looked at the pair.

Mary stepped closer, pushing my sister’s face into her crotch. My own sex itching to be touched, Mary’s moans causing my arousal to rise. “Mmm, expert eating out skills must run in the family. I wonder if it comes from your mom or dad,” she teased. I just shook my head, it was already weird enough having my sister involved. Mary nodded, understanding that my parents would be a step too far.

Mary led Lana to our bed. She positioned her so that I had a full view between my sister’s legs. Mary climbed over her, resting on her face. She stared at me, rubbing at my sister’s pussy. I watched as my girlfriend toyed with her, leaning in to tickle her clit with her tongue.

The pair of them moaned as they continued to pleasure the other. I watched earnestly, rubbing myself over my pants, I wouldn’t be able to hold out much longer. When Lana’s distinguishing features were hidden from view, I wondered if this was how it looked when Mary and I made love.

Mary laid back against a mountain of pillows, she made eye contact over the crest of my sister’s ass. Her round bottom was pointed my way as she brought my girlfriend to climax. Mary’s thighs were clenched around Lana’s pretty blonde head, and I watched as Lana played with herself.

I finally gave in, as Mary licked her own juices off my sister’s face. I quickly unfastened my pants, slipping my hand into my panties, I shivered at my own touch. “Oh my goddess!” Mary called out, “Val are you touching yourself to the sight of your sister? You pervert!”

I whimpered, unable to stop myself now. I was so worked up watching them, the taboo nature of watching my sister and girlfriend had me eager for release. Mary whispered to Lana, “I can’t believe my own sister is such a pervert,” Lana relayed.

Mary sat behind Lana reaching around to play with her pussy. Mary slid her fingers into Lana’s pussy, matching my own speed. She used her free hand to play with Lana’s pierced nipples. Lana’s breathing was quickening, her own orgasm approaching just like my own. I held myself on the edge, waiting for Lana to join me.

My sister and I were brought to simultaneous orgasms. Our cries of ecstasy filled the bedroom, Mary smiled watching the pair of us cum. Lana laid out on my bed, as Mary crossed the room to me. “Want a taste?” she asked, holding up her glistening fingers. It was part of the routine for her to offer after the event.

If I hadn’t been recovering from such a powerful orgasm I might have thought better of it, but in the moment I mindlessly opened my mouth. My girlfriend’s fingers delivered my sister’s cum across my tongue. Her sweet taste filled my mouth as I suckled on the digits.

We have a rule that our bulls don’t stay the night, but I decided to make an exception for Lana’s sake. “I’ll prepare the guest bedroom,” I said, managing to rise to my feet. My legs were still a little shaky.

Lana entered as I finished laying out extra bedding. She was wearing a pair of Mary’s pajama bottoms and one of my oversized sleep shirts. “That was wild,” she said. “I thought she was joking when she first asked.”

“Why’d you agree to this?” I asked, more than a little curious how Mary managed to pull it off.

Lana’s cheeks turned a bright red, “Honestly? I’ve always had a huge crush on Mary. Ever since you brought her home over Christmas break while I was still a senior in high school.”

That actually explained a lot. Lana had always been a little clingy over Mary, I wondered if that night would ease those feelings or intensify them. I tucked her in, kissing her forehead. “Good night,” I said turning the lights off.

“Val,” she said, I paused in the doorway. “I love you.”

“I love you, too,” I said making my way back down the hallway.