Melly, the other waitress

The story so far:

You woke up this morning, a beautiful Saturday in the summer, but to your surprise and shock your got turned into a girl over night. A strange voice calls and tells you that the curse will be lifted in 48 hours and you will turn back into your old self. That is unless you fall pregnant...
You seek help from your family and your mom gives you clothes and a very hands-on lessons of what its like being a woman. Over breakfast they try to give you a new and girly name, but you feel pressured and patronized and leave to deal with this on your own. Your first stop is a café were you are given a job as waitress, along with Melly, the very attractive other waitress.
Waiting the tables is not that difficult, but soon enough the curse makes itself known and you grow incredibly horny. Deciding to take care of that, you go to the toilet and start masturbating. Just before you get your sweet release, there is a knock on the door.

It was the worst timing for someone to enter you could imagine. You are too close to your orgasm to stop your hand from teasing you closer and closer to the edge. Why did she have to enter now of all times? Panicking and still masturbating you try to come up with an explanation for her so that she will be gone as soon as possible.

"Jane? Are you okay? I saw you walking towards the toilets and now you were away quite some time." You hear her stepping around infront of the cubicle doors, going from one to the other.

"YEEEaahh, I-i'mmm fi-ne.", you try to wipe her of, but annoyingly she won't leave. Your pussy nearly starts twitching as you try to cum and to hold of at the same time. Please, a kingdom for some privacy, you think.

"You don't sound fine." to your surprise and shock she now steps right up to your cubicle. And somehow turns the lock form the outside. Before you can react the door bursts open and Melly is grinning down on you. "You sound horny."

Sprung. Sooo sprung and sooo about to cum. And unfortunately helpless to stop... Your finger, all by itself, strokes your clit again, and your whole body explodes in the most overpowering orgasm of my life so far. Your mouth has already been wide open, as you panted into the final moments, and now your pussy cramps hard onto your probing finger and your whole body shiver in a wild, beautiful way which make your lungs push air into the quiet moan you've been forming, and it came out suddenly loud in the public bathroom.

Melly, practically a stranger, standing in the doorway and watching you cum your brains out should fill you with shame, which it does, but at the same time it triggers some new kink in you and makes the orgasm even more intense.