Race to the end

The starting gun goes off and you all race off to a wobbly start. Bad enough there's a dildo in the saddle, but it's somehow rigged to the pedals so you're fucking yourself with it as you ride. You thought pussies weren't that sensitive to penetration, but it's driving you wild and you're pretty sure you're dripping down the saddle considering the squelching sound of the dildo pistoning in and out. Looking around, the men are trying to power through despite their obvious distraction, but most of the women are more focusing on cumming than completing the race.

As you round the first corner, you see a man who was ahead of you leaning over his bike and moaning loudly. One of the Martians is gripping his hips and thrusting into him from behind. As you pass by, his shirt rips as his swelling tits are finally too much for it to contain. You notice several other racers stopped along the side of the track, bent over their bikes as they are fucked by the monstrous invaders. Despite the fear of what might happen if you lose or drop out, the thought of being bent over and pounded until you're another needy slut has you hot and bothered.

Your pussy clenches around the dildo as you push harder on the pedals, driving it deeper into your core. It feels so good and you know you're close to cumming, but you aren't stoping. You can feel the pressure building up inside you as your orgasm approaches. Suddenly, without warning, your body explodes into pleasure and you shudder through the climax. Your vision goes white and you can barely stay on your bike as the wave of ecstasy washes over you and your snatch tries to milk the shaft in you for its seed.

After what feels like an eternity, the waves of pleasure finally subside. As you recover, you look back and see that more and more racers are dropping out. Some have even been knocked off their bikes by the powerful orgasms. The Martians seem to be enjoying this game, ensuring there are plenty of fresh breeders for them to convert. You wonder how many men will end up as need sluts, their ripped clothes the only indication of their former gender.

With each pedal stroke, the dildo continues to thrust into your cunt, driving you to new heights of pleasure. You can feel your new womb aching for release, swollen and ready to be filled with Martian seed. As the race wears on and more men cum too many times and drop out, you find yourself becoming more aroused by the sight of these once proud male athletes being turned into lusty females right before your eyes.

Finally, you cross the finish line, breathless and covered in sweat. Your entire body is shaking with the aftermath of multiple orgasms and you can barely stand upright as you dismount from your bike.

"Congratulations," the Martian announcer says, walking up to you. "You are the first to finish the race." He smirks at your panting form, his massive cock hard and ready for action. "Now, I can offer you a choice. Do you still think you're a man or would you rather I show you how much better Martian dick is than that dildo?"

You thought you'd immediately demand to turn back, but you can't take your eyes off his cock. The thought of that enormous cock plunging into you and filling your empty womb is incredibly enticing. Taking a deep breath, you try to resist as you rub your pussy, your needy snatch still aching for release. But the Martian's pheromones are strong and it's getting harder to think straight. You forgot the effect they have on women. You may not be fully transformed, but the pheromones make your womb ache to be filled.

Desperately fighting the craving for his dick, you glare at the Martian. But when he leans forward, pressing his massive cock against your swollen lips, you find yourself moaning with delight at the feel of the tip rubbing between your new folds. He teases you, thrusting shallowly against your cunt, never quite giving you the penetration you're craving. With a moan of surrender, you wrap your legs around him and try to drag his cock into your needy pussy.

"Please," you beg him. "Fuck me. Make me a busty slut. Fill my womb with your seed." The Martian smirks at your pleading words as he finally drives his monstrous cock into your tight, eager hole. As his massive member burrows deeper and deeper your body, you feel a pleasurable energy flow through you as your transformation begins. You shudder with pleasure as he fills you completely, stretching your pussy beyond its limits. It feels so good, so wrong, and yet so right.

As he begins to fuck you hard and fast, you can feel your body changing beneath him. Your hips widen to better birth his spawn, your ass plumping up as your nipples crinkle and harden. Your chest tingles and throbs as it swells with an unfamiliar heaviness. You clutched at your chest, gasping in shock at the sensitive mounds you now sport. With each thrust you grow more feminine and all the while your cunt clenches around his cock, trying to milk him dry.

The Martian continues to fuck you, his powerful strokes driving you deeper into submission. Each thrust feminizes you further until you can barely recognize yourself. Where was once a strong, confident man is now a busty slut, **** to be used. Your moans of pleasure become cries of submission as you beg him to make you his.

Finally, after what feels like an eternity, the Martian reaches his climax. He thrusts deep into your gut, filling your womb with his hot seed. As he empties himself inside you, you feel a wave of ecstasy wash over you. Your muscles tense and release as you cum hard on his cock, milking every last drop of his essence from him. As you collapse onto the ground, spent and satisfied, you look up at the Martian. Your eyes are filled with gratitude and lust.

"Thank you, master. This breeder's pussy will always be ready for you."