Giantess Unaware - Booty Bike ride

It was such a beautiful day, you had to get out and enjoy the sun. You felt like going for a bike ride despite the fact that you didn't actually own a bike.

Your cute neighbor however, did own a bike and she wouldn't be home for an hour so you figured you knew her well enough that you could borrow it without asking.
You head outside and see her bike in the driveway, not locked and ready to go. It was perfect.

The moment you sat on the seat you felt dizzy and everything went dark as you felt yourself pass out. You awoke some time later to find yourself shrunken on the bike seat. You knew right away what had happened but you stood there awestruck as your brain tried to process this familiar but oh so alien world.

A car door closes at the end of the driveway, which looked to be miles and miles away. You see your cute neighbor get out of an uber as she closes the door behind her and starts walking in your direction.
She was so far and walked in almost slow motion but with only a few steps she traversed the miles of land to be standing right infront of you.

"oh thank god" you sigh with relief. "Hey, I kinda wanted to borrow your bike but I think I caught the shrinking virus. Could you call a Doctor for me? ..... Hello?" Your words trail off as she continues to stand there and you start to realize she can't hear you. It makes sense, she might be right infront of you but her face was a skyscraper's height away from you so you start jumping and yelling louder but it's no use.

You're looking at this Giantess beauty with her tight jeans right infront of you and as you look up you see her toned stomach and tight, revealing shirt, barely able to hold her massive breasts in place as they lightly sway and jiggle with each subtle movement she makes. Finally she makes a move, you are knocked to the ground..or seat.. with the pure awesome power you witness as a giant sexy leg swings over you with impossible ease. When you get up you see only blue ahead of you, the blue from the ass of her jeans and WOW were they tight. You take a moment to witness the glory before you when you hear her tell herself "Nice Day for a ride"

"Noooo!" You yell as you feel the seat beneath you shift and move. Your balance tossed around as you struggle to stay on your feet but eventually land on your knees. You feel the wind and force of movement increase as she begins peddling the bike. Her ass cheeks moving from side to side is both mesmerizing and terrifying as part of you can't help but be turned on at the show however the other half of you knows that at any moment this sexy ass could sit on you and end your life.

Bit by bit her ass creeps more onto the seat, pushing you closer to the edge. If you fall from this height you will die but if you don't respect her encroaching ass you will be crushed.
While trying to decide a coarse of action her ass raises in the air and you're thrown flying forward as she hits the brakes. You land on your stomach at the very front of the seat and have only enough time to roll over and look up as the crotch of her jeans comes down on you, smushing you into the seat.