No, she runs into someone she knows.

Walking through the park Lilly sees a familiar face among the crowd. Lillys step sister Amanda is walking all alone near the tree line. Amanda is only a few days older then Lilly. She is just slightly taller then Lilly standing at 5'1 they both have the same blond curls but Amandas aren't for real. She colors her hair and curls it every morning to emulate Lillys naturally occurring locks. Amanda small stature makes her look much younger then her age just as Lillys does, but Amanda doesn't have the large breasts like Lilly. Amanda is all but flat chested a small A cup, she could pass as almost prepubescent. Amanda and Lilly could pull off being twins besides the **** difference in cup sizes. Amanda is wearing a red and white plaid skirt much like Lillys a favorite style of both girls. She has a white tank top on that clings to her small buds. Amanda never wears a bra seeing how she really doesn't need one, her nipples seem to always be at attention.

Lilly stalks up behind her sister making sure that the slightly older girl doesn't notice her. As they round a bend and no one is in sight Lilly pounces. She grabs her older step sister by the waist, cupping her hand over the older girls mouth. Pulling her down Lilly and Amanda fall into the bushes beside the path. Lilly has her sister in front of her practically spooning the slightly older girl. Lilly pins Amanda with her legs and keeps one hand on her mouth pulling her head to the side so that Amanda can't see her attacker.

Lillys hand leaves Amandas waist and travels down to her skirt. Flipping it up Lilly pushes Amandas small g string panties to the side and inserts a finger up inside the other girl. Amanda is thrashing and trying to scream but Lilly can feel the growing wetness in between her sisters pussy lips. Lilly slowly pulls her finger out of her sisters hole and then shoves it back up inside as far as possible. Amanda makes a small sound Lilly isn't sure if it a moan or a sign of pain. Amandas pussy is now extremely wet but the girl is still struggling against the unauthorized probing. Her body seems to want further penetration though she is fighting it with all of her might. Lilly adds a second finger and feels Amandas insides contract squeezing her two fingers.

Lilly puts her mouth to her sisters ear and says in a gruff voice "Your pussy is so wet, what a naughty girl."

Instantly recognizing Lillys voice Amanda stops struggling. She gives in to the wants of her body and starts gyrating her hips on her sisters pelvis. Lilly pushes another finger into her now willing sister. She uncovers Amandas mouth and starts rubbing her child-like buds, tweaking the writhing girls always attentive nipples. Amanda quickly cums on her sisters nimble fingers sighing and thrusting her hips one last time.

"Mmm that was a good surprise Lilly!" Amanda says turning around and giving her younger sister a kiss on the lips "Oh and Happy birthday! We should go somewhere and celebrate!"