You blinked.
You had been on a bus. You were certain of that. But that bus was normal-sized. The bus seat you were currently on was gigantic! Then the memories came flooding back. Yes, you had been on a bus. You had sat in the seat across from Sarah, a brown-haired bookworm. Then, for some unknown reason, everything went dark. When you regained consciousness, you found yourself on a vast grey plain. It was a bus seat. You had shrunken to ant size!
As if in assent, you heard the loud rasping noise of Sarah turning a page in her book. You turned. She hadn't noticed your predicament, and was instead staring at her book. She shifted a little in her bus seat, the butt of her blue jeans rocking from side to side like the hull of a weird ship in the waves. You were about to yell at your neighbor for aid, but then there was the hiss of the brakes as the bus stopped and opened its doors to let on two more bus riders. The back of the seat in front of you prevented you from seeing their faces, but you already knew who was on this route, and who was getting on.
One of them, Faith, was one of your good friends. She was a gymnast, and as such was strong and flexible. Though she could almost be mistaken for a child, she had one distinguishing property; her rump. While by no means gigantic, it was certainly disproportionate to her size, an observation often accentuated by the fact that she wears form-fitting jeans. Of course, there was one thing about her that grossed out most people; Faith farted. A lot. She was perhaps the kindest person on earth, and her gas was perhaps the earthiest. If she found you, she would probably help you regardless of circumstance, or, barring that, she would keep you as a pet.
The other one, Kathryn, was a clumsy athlete with a big heart and bigger hindquarters. While she was a good friend of Faith, you didn't know her that well, except for what was obvious. 1) She was less graceful than a drunken elephant on stilts, 2) Her rear was the largest in the school, bar none, and 3) Having a large butt and 'Raat' as a surname was a very humorous combination, despite Google Translate saying it meant "honeycomb". Later, you found out Raat's ass (snicker) was also not very sensitive. If she found you under her, which was a big "if", she would probably either think you were a bug or she would torture you using her ass.
The two girls walked down the aisle and stopped at your seat. To your horror, they began to sit down. Which girl's rear are you under?