The "Trap" P1

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#7 of RP Adaptations/Collaborations/Main Series

Featuring help from monazomatu

In progress! Back Story. Ideas would be helpful.


It was Halloween, and he had to spend it with his torturous sister... Bri thought, searching around a cave that stood behind his house. He spotted a weird substance and wanted to play with it. It was green goo was amassed in a puddle near the entrance and Bri took care to scoop it into a cup, a little blob of green goo the size of a softball. He wanted to look at it closer after a while so he took it to his room and set it down on his side table next to his bed. He looked up at his wall clock and noticed it was 6. It was time to get ready for trick or treating and his parents couldn't afford to get him a costume... So his two year older sister, Melody, gave him a pair of her white frilly panties, a pink miniskirt, a training bra, and a pink t-shirt with a heart on it.

Bri was forced to wear these clothes as his parents were gone for tonight and his sister was in charge. He hated the color pink and his sister for making him wear pink clothes. Anyways he couldn't do anything about it so he reluctantly slipped on the panties followed by the skirt. As he grabbed for the bra, suddenly there was a loud knock on his door that startled him and caused him to bump his hip into the end table. The cup fell over and spilled onto the table as he frantically stood the cup back up and scooped the goo back in before frowning at his door. His sister yelling, "Hurry up!". Bri scoffed and grabbed the training bra, putting it on. Unbeknownst to him a good golf-ball sized amount of goo was on it. Nether less, he finished by pulling down the girly t-shirt and looking at himself in the mirror. He kinda did look like a girl...But he didn't care as he waltzed out of his room reluctantly.

His older sister laughed at the sight of him, it was priceless to torture her little brother and now she was going to embarrass him all around town. She was only 15 years old, and she had a curvy...well developed body. The same light brown hair color and blue eye color as Bri. She would toss him a bucket and beckon him to follow her into the streets of horror. Outside Bri would shake nervously as he trailed his sister, whimpering softly when going up to any of the houses and especially being asked what his costume is. Whenever one of his school friends would walk by, his sister would call them out and show him to them. Most of them laughed at him, some of them looked away. Bri was hopelessly embarrassed and ashamed, he didn't know if he could go back to school after this was over...he felt hopeless! It was the end of the journey after a while and there was only one house left...a scary looking one ... with lots of mysterious obstacles and a long curvy path to the door. It scared Bri and it even scared his sister who pushed him onto the lawn and told him to go to the door. Bri cried in protest but couldn't refuse as his sister would hand out photos of him like this to all of his friends and classmates. With no choice he reluctantly walked through the path shivering harshly... He was soon hidden by bushes..

As he walked scaredly he felt something weird on his chest. The bra was already making him feel weird but something else was causing this... The sensation spread up and down his chest, causing him to jerk back instinctively. Then the sensation spread into his panties and then his fear overtook him. Bri tried to move back towards the street, not making it far before losing control of his legs and falling down. It was horrible, something was pressing against the tip of his length and..Mew!..forced its way inside. The sensation also appearing from his shirt and revealing itself as the goo...crawling up his neck.

Bri mewled loudly...so loud his sister could hear him and ran away frightened. He cried as the green goo climbed up his face and slid into his nostrils. The goo in his panties succeeding in making its way in entirely. He mewled as the goo caused an erection of 6 inches long... He was a little big for his age...but once the goo reached his balls the mass started pulsing around. He started to feel weird...his chest flared up...unbeknownst to him the goo was making his hormone count different... Taking away the hormone levels of a boy and making them to the hormone levels of a girl... He watched in fear as his length receded through his clothes becoming something like 3 inches, not noticing his growing small breasts. The goo was relentless in its attack, suddenly his head began to feel lightheaded and his mouth began to drool. A momentary headache following, His memories of being a boy flowing away...

Bri felt his comfort come back to him, feeling right at home in his favorite outfit. He felt awkward about his lifestyle until now, deeming it was just a dream...He knew that he was a she in reality. She had a wonderful older sister and a loving family. She especially had ladylike habits too. It was all coming back to her. Standing up she strolled back towards the street, dazed. Bri soon saw her loving sister who she ran up to. Her sister sighing in relief before flicking Bri's nose. "If you scare me like that again...I'll send the photos..." However to the sisters bewilderment, Bri smiles "I don't mind if you send cute photos of me." And the sister laughs awkwardly, "It's sure is embarrassing to have the others see you dressed like that..." she remarks before stomping her foot and whirling around to lead him back home. The girl pouts the entire way there, obviously upset that she had lost her chance to embarrass her brother with the clothing

Bri follows her sister home slowly and happily, her dear completely gone.

A change occurs in Melody's approach.

The neko looks her brother over curiously as they walk into their home the clothes seemed...fitting? Before you could kinda tell he was male but now, now it just seemed like he was a flat girl

Bri would sway her hips daintily as she walked, she indeed had breasts the size of half baseballs but they must not have been noticeable in this light, even her small round balls couldn't be seen making a nice little bulge in her well fitting panties. She happily ran up to her house doorstep and walked inside without her sister, Melody.

Melody sighs once more to herself as her bro- WERE THOSE BREASTS?! The older memo stumbles back a bit in shock before half running after her brother, calling out almost panicked. "Bri turn around! And um... I need those clothes back now that we are done with trick or treating."

Bri turns around,Looking a little scared. "But I need these clothes too..." She whines, holding her chest.

The sister laughs and shakes her head, stalking forwards. "Nope! Strip... in fact you're gonna remain naked for the rest of the night."

Bri whines louder, "At least let me keep my bra and panties sis..." She takes off her shirt, giving Melody full view of her breasts which were making nice bulges in her training bra.

Melody shakes her head again, licking her lips as her eyes flit over Bri's body, very obvious confused. "...what? Oh, uh no you have to be naked! I'm in charge remember?"

Bri reluctantly takes her shorts and panties and her training off revealing a very tiny shaft, the only thing big was her balls and they were the size of pistachios. She whines covers them, her B cup.breasts full show to Melody.

The neko gives a small giggle, shaking her head. "You somehow get all of the size from your tiny dick to go to your chest and you still look like an awkward eleven year old."

Bri whines falling onto her hands and knees, "Why can't we ever get along as sisters..."

She sneers as she looks you over. "Because we aren't sisters, you aren't a girl... you aren't quite a male either though, you're something... lesser."

Bri cries "I've always been a girl..."

Melody shakes her head and walks over, daintily holding a foot out towards her. "No, you haven't. But if you do what I say, I will make you one."

Bri nods, still sure she has always been a girl. "Brianna always does what sis says because Brianna loves sis so much."

Melody nods back before turning to go sit on the couch. "So then if you are a girl do you masturbate with your pussy?"

Bri tilts her head, "Mass-turr-bate?"

Melody grins brightly. "Ooooh this will be fun, go to my room, in the top drawer there is a box, bring it here."

Brianna slowly walks into her sisters brightly colored room, everything felt soothing inside. The stuffed animals, the bed sheets, and the toys. She opened the top drawer and pulled out the box, shortly before bringing it to Melody.

Her sister continues to grin as she returns. "Alright, there is a tube of gel in there, get some out and rub it into your ass."

Bri steps back a bit, "On....my rump?" She whines.

The girl nods. "Yes, you gotta get it wet before you can use it."

Bri slowly squirts the gel on her hand and kneads it into her bum-hole.

Melody grins as she watches you rub it in

Bri stops kneading after its slick. "Like this?"

She nods. "Yes, now get out the purple stick in there and SLOWLY put it in."

Bri takes out the stick and slowly presses it into her bum-hole gasping.

Melody watches, grinning as she watches you

Bri leans forward whimpering as it slides all the way in.

The woman gives a giggle at the sight. "How do you like it?"

Bri mewls, "I-It's spreading my insides....huff....it's nice..."

She nods. "Begin moving it in and out."

Bri huffs," It feels so weird", with a blush

Melody nods, reaching down absentmindedly to rub at herself through her skirt. "Goood job Bri, this is the first step!"

Bri murrs shaking about, "F-first step?"

Melody nods once more. "But of course, becoming a woman is not as quick as sticking something up your tail after all."

Bri whimpers, "But I already am a girl..."

She nods. "Perhaps, but there is a difference between a girl and a woman."

Bri pulls the stick out of her tail-hole, "But your not a woman either sis..."

Melody pauses for a few seconds before blushing brightly and looking away. "Well...I am closer than you!"

Bri mews softly, "Can I please have my clothes back sis, I feel insecure..."

Melody considers for a few seconds. "Hmmmm you can wear a swimsuit."

Bri tilts her head in puzzlement and whines. "But swimsuits are for swimming..."

She nods and smirks a bit. "yes but you need new clothes and most of mine would be too baggy on you

Bri eeps in excitement, "New clothes!? Where?!"

Melody giggles. "We will buy you some."

She whines, "When? School's tomorrow and all my clothes have disappeared!"

Melody shrugs a little bit. "I figured as soon as mom and dad got home so we could use the credit card."

Bri eased up a bit, she forgot her parents were going to come home with money. But what would happen if they saw their little Bri like this, it was quite uncertain....

To be continued....