To a height of about 30 feet

By: mazomune

Kim keeps getting taller every day, until she can no longer stay in the house. By the end of the week, she's taller than a bus is long and your family has had to move to a farm outside the city just to house her. It also gives her the opportunity for more private time now that the media have become bored and moved on.

"You still enjoying this, li'l bro?" Kim's voice booms down as she lowers her balls onto your face.

Kim is five times taller than you now, and her erect cock is slightly bigger than you are. Her now truly gigantic scrotum is like a beach ball and easily covers your entire head. The pressure of her heavy balls feels like it's covering your face and no matter how hard you try, you can't push them off; Kim laughs at your vain attempts to rescue yourself. If anything, the ticklish thing wriggling beneath her sac is rather pleasurable. You would scream for help, but the barn she sleeps and abuses you in is too far from civilisation for anyone to hear you.

Kim grinds her balls into your face as your arms and legs flail helplessly. She keeps laughing at you as she begins to bounce, bringing the colossal orbs down on your face and chest with a huge thud each time. When she lifts herself up you have time to breathe, but you're also confronted with something even more terrifying; the gargantuan cock flopping just behind your head every time she squats down. Even flaccid, it's four feet long and so thick it probably weighs more than you do.

"I know you love my balls, Willy. But it's time to play with my cock now."

Your big sister gently pokes your face with her soft cock and your entire skull gets taken up inside her foreskin, as if a thick, heavy bag were being placed over your head.

"Isn't this fun, Willy?"

Kim makes sure her foreskin has completely enveloped your head and begins to stand up. You feel yourself being lifted into the air by your head, trapped in this stinking helmet as your face is rubbed into her smegma. You daren't even try to get out once you get into the air because that would just mean falling onto the stone floor and hurting or killing yourself. Then Kim does the worse thing possible: she begins to swing her mammoth cock from left to right, taking you on a horrifying ride suspended only by the vacuum her cock creates and the sticky fluids from her cock.

"AHAHAHA! Willy, you're swinging from my cock! Isn't this just great? You'd better hang on so you don't fall off!"

You need no encouragement to follow this particular command, grabbing onto her foreskin and holding on for dear life as you swing back and forth from out her cock. With each swing, she seems to gain more momentum, until by the end it's spinning like a windmill as you try desperately to survive. In her delight at her new power, Kim has lost all sense of conscience and acts purely according to her id. Even if she's aware of how dangerous this is to you, she doesn't care. Despite hanging on as hard as you can, you know that you can only hold it for so long. If she keeps going for another minute, you're going to fall out, perhaps being thrown into the air or dashed against the wall at high speed.

Then, the ride slows to a halt. Kim stands there with you dangling and wishing you could scream, and you feel the pressure and temperature increase. Blood rushes into her cock and you feel yourself being **** down by the head of her cock, which is trying to break free from the foreskin that envelops your own head. The bigger head, Kim's, wins the struggle, and you get popped out onto the floor, falling gracelessly but safely onto your ass. Kim reacts hysterically, indifferent to your suffering.

"Willy, I shot you from my cock, hahaha! Aww, and your head looks all sticky and covered in gunk! Anyway~, it's time for the best part of the night now".

You look up at Kim as her behemoth cock slowly erects above you. You see her balls tighten, her foreskin pulling back to reveal her purple head and the shaft changing its angle to tilt slightly upwards, completely covering you in its shadow. Even though this situation objectively seems to be like the previous one when you were small, it feels different now. Her huge organ no longer simply looks like a giant-sized cock; it's now a wonder of nature than you can't help but stare at in awe and admiration, even when you fear it will crush you.

"Little Willy, it's time to please my big willy!"

Kim lowers her cock to your eye level, forcing you to look once again into its giant slit, thankful now that you're at least big enough to avoid fitting in there. Before you can fully catch your breath after the nightmare fairground ride you've just been taken on, the huge thing hits you like a battering ram and knocks you down.

Kim grinds her cock onto your body just like she ground her balls earlier. This time, every inch of you is crushed beneath its weight and you feel your ribcage struggle to avoid cracking under the pressure. Kim thrusts slowly, but with ****, rubbing her sensitive frenulum against your face for stimulation. You're coated with her precum, which is almost a blessing as it allows you to wash off the smegma she got on your face from her unwashed cock when your head was in her foreskin.

Kim uses your body for her enjoyment for several minutes, but it isn't enough for her to cum. Looking down on you, she lifts you onto your feet and knees down, putting the tip of her monster just in front of you again.

"Little Willy, why don't you play with Big Willy? I bet he has a present for you!"

You hate this game, but you couldn't think of any way to stop it. She's so big that whatever she wants, she can get. No-one can stop her.

You rub your hands all over her shining glans and into all the sensitive spots. The head of her cock is almost the size of your torso and your whole hand feels like a light fingertip to Kim and she gasps with pleasure, loving every second of her little brother servicing her. You've become quite adept at this during your time as **** to your giantess sister, and within a couple of minutes, Kim is at the brink of orgasm.

"Will! Keep on! That's right! I'm almost there!"

Enduring the eardrum-rupturing noise of her screams of joy, you pick up your pace, frantically covering every inch of her cock with your hands and finish by fisting her slit while tickling her frenulum, just how you know she likes it. Within seconds, the inevitable happens.

"Ahhhh! Will! I'm cumming!"

Kim's cum blasts you in the chest, throwing you back several feet and sending you to the floor. As you lie there, more spurts of jizz land on your prone body, each knocking you down as you try to get up. As you lie there smothered in her seed, Kim stands up and brushes herself off.

"Ah, that was great! I hope you enjoyed it as much as I did, li'l bro!"

Without any ceremony, Kim turns off the light in the barn and lays down in bed, leaving you to make your own way out. As you lie in a pool of your giant sister's cum, you wonder how much worse things can get.