You don't want to, but you have to

With Gwen's fingers slowly probing your clit and tweaking your nipples, the pleasure is driving your brain towards irrational options, you have to spill the beans, then you can cum. You manage to moan out a response to Gwen's unconventional interrogation,

"ffucckkk, it's m-magic or something. I'm a girl for 48 hours. But if a guy fucks me and cums in me, then I'll get stuck like this. Also I'm fertile, so I'll get pregnant too."

Gwen's fingers work back to full speed. The pleasure finally drives you over the edge as your body spasms in its first orgasm as a woman. Your mind blanks out for a bit, only to recognize Gwen, smiling at you like cat who's caught a mouse. It's unnerving to say the least. Oh right, you told her everything, hopefully she decides to not **** this knowledge. She laughs as she begins to consider your position.

"Alright, so you're stuck as my cute sister for 2 days, unless some stud comes over and breeds you? I'm kinda wondering what a pregnant tomboy would look like, do they even have maternity clothes in men's styles? Aww, don't get that look on your face, I won't have someone come over to knock you up...yet. I'll help you and you can help me okay?"

Great, whatever, your sister has always worked like this, as long as you keep your end of the bargain she'll certainly keep hers, but then again the stakes are a hell of a lot higher now than ever before. Gwen checks her phone and the Cheshire cat grin gets even wider.

"Alright, I've decided on what you're gonna do! We're gonna meet up with a friend of mine, you'll love him! Also, you're gonna stay dressed like that too."

This just gets better and better