Jen had been noticing how weird her crotch kept feeling this morning, with various periods of odd pressures in her pants. She decided, as she moved along the hallway toward Principal Cartwright's office, that she could really use a quick trip to the restroom to make sure she was feeling alright and to freshen her makeup.
In the restroom, walking past some of her fellow students she noticed an increase in pressure, to the point of nearly pain, as she observed their various states of undress and makeup usage. She thought it a bit strange that some of them seemed much more attractive to her than normal, but had always been a little bit bi. Once in the stall she got around to unbuttoning her jeans and sliding them down, only to reveal a rather sizable cock (Mr. Oswald's).
She had no idea what it was doing there. She did notice that it was quite tumescent from arousal and that if she expected to walk to the Principal's office and not look like she was carrying some sausage in her pocket, she would need to get it down.
In a bit of a subconscious move she found herself gently rubbing the cock with toilet paper, slowly masturbating it as she had seen only in Sex Ed. She was amazed at how pleasurable it all felt, and having little prior experience with such a tool she found herself shooting her load into the wad of toilet paper very soon after she had started. She was surprised that she did the entire act basically in silence, in comparison to some of the moans that might be typically heard from from such a stall when a young woman masturbated.
She finished using the restroom, in the back of her head wanting to try it standing up but too afraid to so with so many other girls in the restroom. The now shrunk cock fit much easier into her panties and relaxed fit jeans as Jen prepared to finish her journey to visit the Principal.