Note : This story is completely fictional!

A few weeks later, one afternoon when their parents were at work, Kaitlyn and Amy lay on Kaitlyn"s bed. Over the past few weeks, Kaitlyn had fucked Amy"s 18-year-old behind many times with the vibrator. Spurred on by her little sister"s lust for this treatment, she had tried and loved it many times herself. Amy had just had an especially good orgasm and was resting before she would return the favor to her big sister.

Amy got up and took the vibrator to the bathroom and cleaned it up for her sister. When she returned Kaitlyn was sitting up looking at Amy lustily. "What is it, sis?" the little girl asked. "I have something different in mind today. I want you to use your fingers on me again like before." Kaitlyn replied. Amy looked puzzled. "I thought you liked the vibrator better because it is bigger and longer?"

"I do, but you"ll see what I have in mind." Kaitlyn got on all fours with her shoulders on the bed and her hands on either side of her ass, spreading it wide for her sister"s inspection. It was a familiar position, and not entirely comfortable, but it seemed to make for the easiest and deepest penetration, which she had come to desire.

"Put on one of the surgical gloves I brought home." Amy obeyed her sister. "Now cover the whole thing in KY." Amy caught on to what her sister wanted. "Oh Kaitlyn, I wanted to put my whole hand in you before, but I was afraid I might hurt you.” "Don"t worry little sister. If it hurts I"ll stop you." Amy got on the bed behind her sister. She pushed two, then three fingers into Kaitlyn"s bottom with ease. She wiggled them around for a minute then added her pinky to the other three. Kaitlyn felt her asshole stretching to accommodate the larger intrusion. It was like nothing else mattered. Her whole being was focused on her butt hole. She felt the fingers wiggling inside her and it sent chills up her spine.

Amy used her free hand to play with Kaitlyn"s clitty while she worked on her bottom with the other. After a few minutes of pushing and twisting, she had worked her thumb into the hole with her other fingers. Her big sister"s hole was squeezing so tight on her hand she almost couldn"t stand it. Kaitlyn felt her 18-year-old sister"s thumb slip into her and she involuntarily tightened up for a second. After the sensation passed she told her sister "Pull your hand out and make a fist with your thumb under your fingers. Now push it into me all the way." Kaitlyn pushed out with all her strength, as her sister"s small fist shoved it"s way into her bowels. She grunted as she felt the knuckles finally slip on into her rectum, and her asshole contracted on her sister"s tiny wrist.

Amy could barely believe her eyes. Her whole hand had disappeared inside her sister"s bottom. She thought of how good it must feel to be filled up so much. She doubled her efforts at her sister"s clit and began to twist her hand around inside Kaitlyn.

Kaitlyn couldn"t believe the incredible sensations. She had never felt so completely full in her life. Her clit tingled with Amy"s stimulation. She felt her orgasm coming like a tornado. Lightning pleasure shocks shot out from her stuffed rectum as the most powerful orgasm of her life ripped through her. She convulsed and screamed with the overwhelming sensations. Amy was a little startled at first when Kaitlyn screamed. But when she saw the look of shear ecstasy on her big sister"s face, she knew she"d really enjoyed it.

Kaitlyn collapsed on the bed, exhausted from her gut wrenching orgasm. She had no idea how much time had passed, but when she finally came back to reality, Amy was cleaning up the mess they had made. Kaitlyn thought about how much she admired that insatiable little 18 year old, and how thankful she was for their fun times together.

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