"T-that's enormous! Y-you really want me to t-take all of THAT!?" Riley exclaimed, looking up at the gigantic, thick 2-foot-long horse cock that throbbed inches away from her face. "B-but I'm a g-guy!"

her cat friend Luna giggled, watching on from the sidelines. "You're not a boy anymore! Your new female body is built to handle any and all alien species for sexual purposes. That's the only way you can neutralize the threat and save the city!"

"Y-you c-can't be serious!? B-but if there's no other way..." Riley relented, looking back down at her massive, pillowy breasts as they wobbled in the cold night air. Her thick ass raised, she closed her eyes and prepared for the feeling of being taken like a bitch in heat as she hiked up her skirt exhibited her dripping pussy to the horse-looking invader. "You know, when I said I wanted to be a superhero, I didn't mean it like thisssssssssssssssss!"

Riley was your average high school guy who loved watching anime and reading comics of amazing superheroes, and always dreamed of getting superpowers and saving the world to break up the boring monotony of class. Wishing upon a star one day to become a hero, a cosmic entity heard his wish and bestowed to him a magical staff that would allow him to transform into a Space Scout, saviors of the cosmos, as well as a talking black cat named Luna to help guide him to his full potential. There was only one problem: whenever he transformed into his hero form he became a very sexy, hugely busty blonde woman in a very revealing sailor uniform, a body perfectly designed to satisfy the sexual urges of any threats to humanity by literally pleasuring them so hard they were knocked out! His first mission was to try and neutralize a dangerous equine invader who threatened his home city, and it certainly wasn't hung modestly...

"OoOoOoOhHhH!" Riley moaned, gloved hands digging into the ground as she bit her lip and tried to ignore the incredible pain of the alien penis penetrating her from behind, feeling like it was going to tear her in half as inch after inch forced its way into her womb. She could feel the bulge in her stomach as her huge boobs bounced with each thrust, an otherworldly warmth pumping through her blood as her cheeks turned bright red with erotically-charged distress. I'm not really enjoying this... surely not? She thought, and yet with each moan that escaped from her lips she could feel herself whispering "Harder! More! Fuck me!" under each breath, quietly begging to be impregnated and treated like a desperate little cum dumpster. The feel of the invader's strong balls slapping against her thick ass felt like getting spanked by her dirty master, and the submissive humiliation of being reduced to nothing but a breeding bitch somehow made everything infinitely more arousing. Time and space became a blur as her entire world was consumed by a singular instinct: to milk colossal cocks with her flawless, lewd body.

After countless intoxicating minutes and incalculable heart-stopping feminine orgasms, she finally felt her partner's dick make one final, deep push forward as it pulsated and erupted with load after load of semen, filling up Riley's insides with so much hot, salty seed it made her stomach look bloated. As the monster that had fucked her collapsed unconscious onto the ground, disintegrating into ash almost instantly, Riley fell by its side. Still soaking in her own sweat with excess cum now running down her thighs, her large titties heaved up and down as she recovered her stamina. "That... was... s-so... embarrassing..." she sobbed, covering her face with her hand in shame. Now that the fog of lust  had dispersed from her brain all that remained was a very sore orifice (still half-filled with the baby batter her accomplice left behind), and a feeling of utter disgust with her own sinful behavior. "You're telling me... I have to do this... every week!? Become a GIRL... and let aliens have their way with me!?"

"Well, it's not exactly like this every time..." Luna explained as she approached her apprentice. "For example, the Blorgonians are an octopus-like race that all have enough tentacles to fill all of a Scout's holes, the Paratai are plant-based lesbian cowgirls with spores that'll temporarily make your boobs swell with milk and grow bigger than the rest of you, and the Kraxis are a legion of anal-obsessed androids who can only be finished off with, well..." Riley groaned, blushing in anxiety as she realized that the fate of the planet now rested in her hands... and in her pussy, within her mouth, and between her tits...