It is a hot summer day and you are at your yearly family barbeque. Your parents throw one every year, and have been since you were a small child. It is actually something you've always enjoyed. You get to hang out with your cousins, see your aunts and uncles, eat lots of great food, spend the day by the pool, and most of all, spend time with your big sister Kristen. However, today's barbeque is extra special. You have brought your new girlfriend Marie, whom you have just recently started dating, to meet your family for the first time.

Marie is a bubbly and sociable young woman and is the perfect compliment to your more shy and reserved self. It took a while to convince her, one of your long time crushes, to say yes to a date, but you've had a great time since. Marie has long straight brown hair and beautiful blue eyes. She has a stunning feminine physique with soft skin, fairly large breasts, and a beautiful smile. Sometimes it feels like you really hit the jackpot! Marie has met your parents before briefly, but this is the first time she's ever met most of your extended family, including your big sister Kristen.

Kris is your big sister and you love her with all your heart, even though she can be bossy to you, and she loves to tease you. She has been an out of the closet lesbian for a long time now, and pretty much most of your family has accepted her for who she is. It took you a while to accept it too, but you've come to enjoy the benefits of her new lifestyle. Kris has a sleek, toned body with a bit of androgynous look to her. She has perky breasts, brown eyes, and short hair that she's bleached blonde. She almost always wears a cap of some kind, and it's often worn backwards. Kris has a lot of tattoos and its one of her hobbies. She has a sleeve on her left arm, a mosaic of tattoos on her right leg running from her thigh to her ankle, and multiple miscellaneous tattoos on her body too.

Despite her dyke-like appearance, you have to admit to yourself, you find your big sister pretty sexy. Her tight body coupled with her cocky and playful attitude has always been a turn on for you. You've secretly masturbated to her a number of times in your life, and have made use of her worn clothing, like her panties, bra, and socks to help yourself along. You've spied on her naked multiple times and have even used a hidden camera to watch her have sex with some of the girls she brings back home to bang. Kris once caught you sniffing her used panties when she came out of the shower, and has enjoyed teasing you about it in private.

One thing that does worry you though, is that Kris has been playfully interacting with Marie since she met, perhaps even flirtatiously. She keeps focusing on her in conversation, touching her arm and leg while they talk, and you're pretty sure you literally caught Kris licking her lips while looking at Marie's breasts sitting across from you two at the table - though that might just have been her licking up some barbeque sauce.

However, the big moment that made you feel a little uncomfortable is during a game of Marco Polo in the pool, Kris "accidentally" undid Marie's top while trying to tag her. Marie caught it just in time, and Kris played it off like an accident, but you're pretty sure you saw her open her eyes when she did it. Of course, it didn't help that Marie wasn't mad at all and instead turned it into a playful splash fight.

Naturally, you felt a bit overwhelmed after that and felt the need to cool down, internally and externally. You excused yourself to the bathroom, hoping the air conditioner could help cool you off, only to find out that it wasn't even on. So, you sweated it out in the bathroom for a while and admittedly browsed your phone longer than what would be acceptable before going back to the party. It had actually been a little over an hour.

You figured you'd make a quick stop upstairs to turn on the AC, since it was hot both inside and outside. The panel for it was upstairs outside of your room, so you headed up there, not really paying much mind to the two sets of moist footprints of bare feet that seemed to be heading the same way you were. That is, until you got to your bedroom and heard muffled moaning and heavy breathing coming from inside.

You slowly opened the door, not knowing what to expect, only to be met with a shock. Marie was sprawled out on your bed, her bikini bottom on the floor mixed with your sister's swimsuit. She had her back arched and mouth gasping for her as she gripped your sheets. Then, you saw the familiar backwards baseball cap bobbing up and down between her legs. Your big sister Kris lifts her head and licks Marie's cum off her lips before turning to acknowledge you.

"Sup Bro?" She says with a smile. Marie gasps and looks at you shocked! She's just been caught being eaten out by your lesbian big sister!