Refuse the offer and think of an excuse

As tempting as it may sound, you remember the one crucial part that got everything started. If any pesky sperm manage to wriggle their way into your womb, you will be stuck like this forever. Weak and frail, petite and girly, with an annoyingly heavy pair of tits attached to your chest and an empty void between the legs. On top of that, you will never again be able to interact with your friends and you will have to start over with school, too.

That is a lot of crap to deal with.

No, it's much better to go the safe route and make sure that you get back into your male body as soon as possible. You shake your head. "Nuh-uh, I don't want it bareback." She still doesn't know the reason for it though, and telling her that you will get knocked up feels like a really embarrassing thing to say. The sheer idea that your mother's semen could implant itself in your lady bits and create new life just feels incredibly awkward. "I don't want to deal with spermy thighs and having your stuff leaking everywhere," you point out confidently. It wasn't the actual reason, but it was a reason!

She shrugged and accepted your choice, and the two of you continued eating the remnants of dinner, huddled up around the gradually shrinking campfire. Some noise kept on coming from somewhere in the forest, and you eventually recognize it to be a horse's neighing! Your excitement however wasn't met by your mother, who simply kept eating. "Hey now, wouldn't it be amazing to tame one of those? I sure never had a horse," you point out the obvious, only to realize how girly you were acting. Instead of dropping the topic immediately, your mom picks it up and ruins your hopes right off the bat.

"Unless you've got a carrot hidden somewhere, there's no chance you will get close enough to tame even one of them. Even if you do, the only way of taming a wild horse is by cornering it and mounting it until it accepts you as the master. That's where the cowboy stories got the idea from that every single horse will try to throw you off before it eventually stops struggling. But a real horse? Good luck staying on it, especially without a harness." You vaguely remember that she used to help out on a farm a while back, sounds like she learned a few things.

After cleaning up and burying the leftovers behind the tent, deep underground, you make the last preparations to go to sleep and put out the fire. Leaving the remaining fish in the car will make it smell a little in the morning, but it's better than keeping it nearby and risking to get visited by a hungry bear. Back in the tent, you find your mother already comfortably resting inside the sleeping bag. You quietly join her, even though you only reluctantly allow her to be the 'big spoon' again after what happened last time. It took quite some time and effort to squeeze your way into the bag, but you eventually succeed and close your eyes. Instead of being satisfied with that however, she begins moving again, and you give her a quick glare to make sure she knows that you want to sleep instead of suffering through her attempted position change. Of course, the sleeping bag wasn't any larger than last time, it was barely possible to move around with two people sharing it. Such a picky sleeper!

She eventually maneuvers you onto your belly... and struggles for a few more moments as she slides on top of your naked body, pinning you against the ground while her heavy weight, and the tight comforts of the bag, made it difficult to even breathe - which you're quick to point out. "Now how am I supposed to... nnnh... to sleep like this? You're not exactly light as a feather."

"Who said anything about sleeping?" she chuckled, while most of her body stopped squirming around except for her hips. "You gave me a nice idea earlier," she continued, and you felt something rigid poking the inside of your thigh. No doubt she was horny again, but you made it clear that you've got no interest in being sexually active anymore. "If the mare is stubborn, you simply need to break her in and make her accept her place."

You can feel the naked, bloated cockhead brushing upwards along your thighs, but the sleeping bag was so tight that you couldn't just move out of the way, or even slide a hand down to cover your vag. With your legs tightly closed, you could feel her appendage gradually moving up until she found the spot where your thighs met, just an inch away from your womanhood. "I told you, I don't want to have sex anymore!"

"Yes, and I gave you a fitting analogy and compared you to an animal. You've already got the body of a girl. So tonight, I'll teach you what it means to be a girl. This is for me as much as it's for you." The bulbous, purple tip slides further ahead and you can feel it rudely bumping against the lip of your pussy, squishing against the soft flesh.

"N-no! Are you even wearing a condom? We can do it with a condom if we have to!" It was crazy how much faster your heart was beating now, adrenaline flooding your senses and everything seemed to happen in slow-motion. You could feel her applying a bit more ****, and the plump lip was being pushed inwards, partially exposing the entrance into your pussy. You're well aware that she's quick to climax, and once she's inside you, it won't be long before you're going to take your first creampie.

Your attempts to squirm out of the bag continue, but it's just no use! Even more so with her heavy weight on you, there's just no way to move. She suddenly pulls her hips back, and gives a heavy thrust forward, and you groan out bitterly as you feel her cock just barely missing its mark and instead pressing against the tender area near your clit. Thankfully, while you weren't able to squeeze your hand into the sleeping bag, neither could she! It's going to be tough for her to align the slab of meat with your cunt-hole.

Upon giving it a quick thought, you realize your best bet is to make her orgasm before she can even enter you! But how?! You have to rub her somehow but... you can already feel her moving slightly, nudging against your labia. That's it! You begin to slowly move your own hips, up and down at a steady pace, allowing her cockhead to rub between the smooth folds of your pussy.

Exhaling sharply, you feel your stress fading away. Now it was just a matter of letting her cum and then cleaning your vag again to make sure none of the goo manages to seep inside.

While you raise and lower your hips, your mother was patiently waiting for just the right moment when your hips were at the highest point, and she swung her lower body forward again and pushed you firmly back down against the bottom of the sleeping bag. You gasp out loud as you suddenly feel something stretching the very back of your cunt wide open, and the girthy rod happily bounced against the warm comforts you had to offer. She had done it! You could feel yourself impaled on her dick, breathless and in pain at the sudden intrusion while growing aware of her pleased chuckle.

"Mommy's home," she teased you with a wicked grin, apparently unaware of how shocked you were, or of the risk she was forcing on you to be stuck as girl for the rest of your life! It seemed to be a game to her, or that you were simply playing 'hard to get'. The mushroom-shaped tip of her erection was snugly mashed against your cervix, and you grimace at the unpleasant sensation.

Sure seemed like the time for games was over though, since she began to use small thrusts at a quick pace to eagerly fuck your cunt for all it's worth. Each time, her lengthy rod bounced against your tender cervix, making you tense and groan! You could barely even breathe, each time she buried herself inside you it felt like a needle prick somewhere in your tummy!

Still, you slowly begin getting used to her rapid pace and the pain, and gradually save up enough breath to speak up.

Before you have a chance to say anything, she suddenly slams her crotch firmly against your perky bum! You instinctively shut your legs even tighter, but it was no use - she was all the way inside you already. There was a long, motionless pause that left you confused... but then her dick began throbbing wildly, struggling against the snug comforts of your cunt! It was securely stuck, though... and before long, you grew vaguely aware of a new warmth inside your belly.

The first shot contained little more than pre-cum, clear and translucent as it uselessly splashed against your cervix. The following few spurts were cloudy and thick, containing millions and billions of your mother's tiny tadpoles, each one carrying parts of her very own DNA - with the singular purpose of swimming deeper inside and waiting for the female's body to ovulate.

You didn't know any of that, of course. All you knew right now was the unpleasant, gooey heat that was spreading throughout your vag and how annoying it will be to deal with...