Suddenly, Mary could hear footsteps. She told Matthew to hide under his bed.
"What about you, sis?"
"I'll think of something. Just hide."
Matthew ran under the bed, while Mary ducked under a table. The door then burst open, and two Futarians entered. As they began searching the room, Mary carefully climbed up a towel Matthew had left on the table and sized up the two aliens. They were both wearing dark blue latex clothes, and had dark blue skin to match. Mary also noticed that the two of them were noticeably similar to her and her brother in height. One even had short hair like Matthew. Then an idea popped in her head. Mary knew that to defeat the Futarians, she needed to study them more closely. But she wouldn't be able to do jacksquat in baby human form.
Matthew's friend, Herman, was a big science geek. He'd left the country a week ago to attend some expensive science camp in France, but just a few days before, he was trying to show off his latest invention to Matthew. Mary had been walking to her room with a load of laundry and heard everything.
"Look, I just need a favor, man. This is a one-of-a-kind, never-before invented, DNA transference ray!! I tested it this morning on my mom's beagle and a snake, and well, the results were...not what I expected. Can you please hide it in your room until I get back from France?"
Mary had watched Matthew take the ray and slip it in an old mattress box in his closet. If she could just get to it-BAMMM!!!
The Futarians heard the noise and walked over to investigate. Mary took the opportunity to climb down and slowly crawl over to the bed. Matthew was already waiting there, with the ray perched next to him.
"Did you-"
"I did. Now go distract those two blue bitches while I figure out this thing."
Mary gathered up her courage. If this went wrong, then she and Matthew would be dead, or worse. Walking out into the open, she waited until the Futarians turned around.
"You want me? I'm right here."
The Futarians didn't say a word. Instead, they pushed on the crotches of their clothes, revealing their ten-inch dicks, which they began stroking eagerly. Mary began to step back in fear as the two lustful aliens walked towards her, jacking themselves off. Just then, a burst of light blinded her.
When she opened her eyes, the Futarians were gone. Instead, their clothes lay in piles on the floor, wriggling around. Suddenly, two dickgirls with the same height as Mary emerged from the piles. They looked entirely human, but the anger in their eyes was clear. Before they could attack Mary, another burst of light lit up the room. Mary soon felt her eyes itch, and rubbed them before realizing that the skin on her hands was dark blue. She then noticed her cock, which now stood erect at ten inches, topped off by a blue mushroom head.
"The tables have turned now, you alien freaks!!" Matthew, or Matty as Mary now decided to call him on account of his new gender, snatched up the two former Futarians and gagged and bound them with dirty socks before tossing them in the mattress box and sealing the top. Mary looked up to see that the transference ray had worked perfectly. She and her brother-sister now looked like perfect Futarians.
After helping each other into the tight latex outfits (which, Mary soon realized, were designed to keep the Futarians in a state of constant sexual arousal), they carried the box into the hallway, only to run into a Futarian with braided hair wearing emerald green clothes.
"Libida, Fallopia, have you found the rest of the earthlings? We need to start the gifting ceremony."
Mary was unsure of what to say, but Matty quickly stepped up. "We have indeed found two earthlings, and we present them to you for inspection." Opening the top, the Futarian smiled happily upon seeing the two bound dickgirls. "How thoughtful of you to wrap them for me. Come. It's time to join the others in the ceremony."