Day 3 - Girlfriend

After such an eventful day, sleep came easy. Your brother also honored his word, and kept his hands off you while sharing the bed. It was awkward to sleep naked, but there's worse things for sure.

In the morning, you wake up with a groggy yawn and roll over to your side, only to stumble across your bed partner. Jimmy! Oh, right... you had to sleep in his bed, otherwise your parents would be suspicious of the lie you two came up with. You had to continue pretending you're his girlfriend...

At the same time, you feel his masculine morning erection poking your thigh. After pushing the bed covers away, you can even see a few droplets of precum already seeping out of the tiny slit of his dick. He must be having a pretty nice dream...

You playfully reach over and grab his appendage, gently stroking it up and down, giggling and toying with his foreskin to reveal the bloated, purple mushroom tip. You were getting used to the sight, looking at someone else's penis was no longer as gross and concerning as yesterday. He sure seemed to be horny, so as a dutiful good girlfriend, you don't even hesitate to climb on top of him and guide his cock into the welcoming, slick comforts of your pussy with a single push. It was a little painful to take him in just like that, but a bit of displeasure was part of the job of making him happy.

Feeling that warmth around his dick was enough to wake him up, and he gasps in surprise at what you're doing. Cute, he's shy!

"Whoa, what are you... doing...? Not that I complain, but..."

You smirk back at him. "You wanted me to pretend being your girlfriend, right? I'm just playing the part, at least until I'm a guy again!" Jimmy smiles back at you, intentionally not reminding you of the one thing that could prevent you from transforming back. The **** was taking away all those worries and stressful thoughts just nicely, so it would be a waste to bring them back up. In the meantime, you begin moving your hips back and forth, up and down, getting a good feel for how to use your feminine body. The slippery pleasure slot between your legs hugged your brother's rod in just the right ways, squeezing and stimulating every inch of his manhood. Just a day ago he had been a virgin, and now he had a girl solely dedicated to making him feel good.

It was starting to feel better for yourself as well, all those unpleasant thoughts you used to have? Gone. Maybe it wasn't all that bad to get laid as girl, for now anyways. You continued alternating between bouncing on his crotch and grinding against him, gyrating your hips and stretching every corner of your cunt. It felt good to get a proper dicking. Each time you lowered yourself back down, you could feel his erection bumping against the deepest parts of your womanhood, completely filling you up. It was erotic bliss, being so intimately connected with someone you care about. More so, maybe it was an even better sensation to have a cock buried deep in your cunt rather than to have it simply attached to your crotch...

And just like that, the two of you end up doing what pubescent teenagers do best - fucking like rabbits, all day long and only taking breaks to eat snacks your mother brought in. Not only did you completely forget about using protection, but your new partner enjoyed the bareback embrace of your twat so much that he never pulled out. The shower you had taken the day before was all but wasted, since your crotch gradually turned into a sloppy mess, caked with a thick layer of drying spunk. Together with your little brother, the two of you filled the entire room with the pungent scent of dried sperm and the overpowering smell of pussy.

You were lucky that your chubby brother was practically infertile and unable to get the job done because he was shooting blanks. It would take weeks and months of trying daily before you're likely to carry his child. Your dedication however ensured that your feisty vagina was **** to accommodate so much cum at the same time, that a few stray swimmers somehow reached their goal and ensured your clumsy teen pregnancy regardless.

Your mother became a part of that precious moment as well, while coincidentally walking past the room right when you deliberately squeeze the last bit of sperm out of your brother's baby maker and into your unwilling loins. The final few globs of spunk needed to completely slather your cervix and **** your stupid womb to conceive, making your changes permanent. It had taken just two pills to turn you into a fully devoted girlfriend.

On that day, your mother lost her oldest son, but gained a younger daughter and the pair of twins growing inside her. The remaining few weeks of your summer vacation were a blur of unprotected sex. Fortunately you were assigned to your brother's class when school started again...