All characters are at least 18 years old.
Thanks to Volunteer_ for proofreading and for suggesting to leave this one open ended.
I arrived home from college for the summer after my freshman year on the day of the graduation ceremonies for my former high school. My girlfriend, Sarah, and my little sister, Jennifer, BFFs since middle school, received their diplomas that evening. The two were invited to a graduation party afterwards which I attended with them, to celebrate the day and because I had agreed to drive them home if they drank anything.
The party turned out to be a dud. It was basically an excuse for people to hook up and the girls wanted to leave not long after it got started, so we were home by 11:00. This actually worked out well for me because I'd been able to acquire a full liter of rum from an upperclassman for celebrating with the two girls and I didn't want to drink and drive. So after arriving back at our house we proceeded to sit around in Jennifer's room drinking, talking and listening to music.
We'd all had a couple of pretty strong drinks, with the girls each having a shot of the rum. The alcohol had had little effect on Jennifer's mood though. She was angry because her boyfriend had not shown up to the party and was not replying to her text messages. Sarah, on the other hand, was feeling frisky from the rum and we were making out on the bed. She had done her best to cheer Jen up but my sister was brooding.
"Can you two please stop that?" Jennifer demanded as she scrolled through her social media on her phone.
"Come on, bae." Sarah said squeezing Jennifer's thigh. "Don't be a hater. You know we haven't seen each other in weeks."
"Well, I don't want to sit here and watch you two make out when I'm all alone."
I kissed Sarah again and was squeezing her ass through her jean shorts. She giggled and I felt her hand go down my shorts.
"Mhmmm." I moaned as I kissed on her neck, her long dark hair tickling my nose.
Sarah giggled.
"Come on, now." Jennifer grumbled. "Go to your room, turd."
She pressed her bare foot against my ass and pushed.
"I can't, and you know it. Dad took my bed down and mom is using my room for her sewing stuff." I said pushing back against my sister's foot.
"Well, I wish you would not do that here." she said.
Sarah looked at me then to Jennifer with a grin on her face before pulling her shirt off. I groaned eyeing my girlfriend's body, her trim stomach below her small, perky breasts inside a pink bra. She giggled before kissing me again hot and heavy. My hands explored her pale flesh.
"Damn baby, it's been too long." I said breaking the kiss briefly before focusing on her neck again.
I kissed and nibbled her skin, from her neck around to her chest and along her bra before working down to her flat stomach. Sarah was so thin and had small, barely palmful, tits. She was sexy to me but not very curvy. We got along great and had a very hot physical relationship when we were able to be together.
She reached down, unbuckled my shorts and began to tug them down. If I'd not been a little tipsy I might have protested more because my sister was right there, but I did not fight it. Then Sarah slid down the bed and began to suck on my dick. I looked up at Jennifer who was doing her best to ignore the sex show going on beside her on her own bed, so I closed my eyes and enjoyed Sarah's mouth pleasuring my dick.
She worked my cock with her lips and tongue and licked my balls so tenderly as she stroked it with the lighted of touches; she was a master at blow jobs. Then she came up and began kissing me again, on my lips, then my cheeks and my neck.
"Hey baby, will you go down on me?" she whispered in my ear.
"Seriously?" Jennifer balked. "I'm right here."
Sarah looked at Jennifer and giggled.
I absolutely love to perform oral sex on a woman and my love for it started with Sarah. Eagerly, I agreed and crawled down to her waist where I began to pull her shorts off then her panties, exposing first her hip bones, which protruded from her thin frame, then her dark pubes and pink pussy. It was such a welcome site and I quickly began to finger her as my tongue started working her slit. I heard her moaning as she began wriggling and thrusting her hips up to me. I licked as her curls tickled my nose and I inhaled her musky sex smells; she smelled like heaven. She was getting really wet and I knew she was close. Within a minute my girlfriend was cumming as I wiggled my finger inside her pussy and flicked my tongue across her clit.
After she came down from her orgasm, she rolled over and put her ass up in the air, wiggling it around teasingly. I wasted no time getting behind her and pushed my hard cock into her. Oh god, it had been so long. Sarah's pussy felt wonderful as I slid all the way inside of her. Then I looked up and saw my sister sitting there looking displeased. But Sarah was poking at her and rubbing on Jennifer's thighs. I slowly slid in and out of my girlfriend as I watched her poking at my sister.
"Stop." I heard Jennifer whisper.
"Come on." Sarah said.
"Sarah!" Jennifer hissed.
"He won't care." Sarah whispered. "I know you want to."
Then Sarah completely surprised me by sliding a hand up Jennifer's dress and she began to rub around on my sister's crotch. Jennifer smiled and closed her eyes but it was at least a minute before she really relaxed. I could see her body slump slightly and she slid down a little on the bed giving Sarah a better angle. I realized then that Sarah was fingering Jennifer's pussy.
It was a mix of feelings watching this show. I'd always wanted to see two girls in a lesbian thing in person but this was indeed weird; one was my girlfriend and the other was my sister. I continued to slowly fuck Sarah as I watched the scene unfold before me. Jennifer was biting her lip and making whimpering sounds. Then Sarah moved over and slid Jennifer's dress up to her waist. I could see her blue panties and her pale thighs as my girlfriend rubbed her.
"Take it off." Sarah said.
Jennifer looked up at Sarah, then to me and said,"No, I can't."
"Jennifer, please. I want to."
Then she rubbed Jennifer's pussy though her panties and my sister's resolve crumbled. Jennifer sat up and removed her dress. When she laid back down Sarah began to tug on her panties and Jennifer allowed her to pull them off. I watched in disbelief as my girlfriend leaned over and started to lick my sister's pussy.
Based on how easily this happened, I knew this was not the first time for sure. For some reason this made my cock throb harder; the idea of my girlfriend cheating with a girl aroused me, but knowing it was my sister added a dirtiness to it that felt so kinky.
I thrusted slow and deep watching Sarah lick and finger Jennifer who was moaning and panting and letting out soft pleasureful sounds. It seemed that Jennifer was about to cum when Sarah rose up and began to kiss on Jennifer's neatly trimmed pubic area, then up to her stomach which was, I saw, more filled out than Sarah's waif-like build. She continued kissing and working her way up Jennifer's stomach. As she moved forward, I eased up with her and kept slowly sliding in and out of her. When Sarah's face reached Jen's breasts she reached her hands under and unclasped her bra. Jennifer shrugged out of the garment and I saw her breasts fully exposed. I knew that my sister was more buxom than Sarah, by a good deal. I'd seen her bra in the dirty clothes and knew she was a D cup, but I was not prepared for actually seeing my sister's exposed tits and I had to stop myself from verbally commenting.
I stared in awe as Sarah began to knead my sister's breasts and suckle and pull the nipples with her lips. Jennifer moaned and her hands reached up and caressed Sarah's thin hips sliding up to unfasten her bra. Then my sister began to pinch and tug on Sarah's exposed nipples. Both girls moaned and I continued to watch the lesbian action as I slowly thrust in and out of Sarah's warm, very wet, pussy.
After a couple of minutes, Sarah inched up again and was then face to face with Jennifer and began to kiss on her neck. Jennifer mewed softly. I was entranced by the sight and almost jumped when I felt a hand on mine. I looked down and saw Sarah was pulling my hand up her side and around towards her chest. I had to lean forward and was soon nearly sandwiching Sarah between myself and Jennifer. Then she slid sideways a bit and placed my hand directly on Jennifer's large tit as she began to kiss my sister directly on the lips.
I kept thrusting into my girlfriend as she passionately kissed Jennifer, their tongues intertwining. My sister's tit felt enormous and firm in my hand and I could feel the pebble of her hard nipple in my palm. Feeling very self conscious, I gently squeezed her breast expecting a protest but instead heard Jennifer moan deeply and saw her kiss Sarah with more fervor. Prepared to stop at any second I continued to squeeze and fondle the large breast marveling at the size of it. I'd been with other girls before Sarah and had seen larger ones than hers, but I'd never seen or touched one as large as Jen's. Even though it was my sister I was having an amazing experience with my cock buried inside my girlfriend and fondling a huge tit.
