It was with a huge sense of relief that Georgia generously allowed Porschia to have you first. It was also decided that each of them would keep you for four days. Now you're stood in front of a giant keyboard on the computer table in Porschia's bedroom. Porschia is sat on the armless office chair in front of the table.
"I think I'll make you a bit bigger", she says.
With that, you feel the tingling sensation and then you grow to about eight inches.
"That's better", she says. Then she smiles and says, "That is so cool. I can make you any size I want. I can make you bigger. Or I can make you smaller. Depending on my mood".
"So," she says as she puts her hands on her knees and leans forward. "You wanna be your big sis's little slave huh?"
"Yes mistress", you reply. "I would consider it an honor if you allowed me to be your slave"
Porschia giggles and bites her bottom lip. "I like that", she says softly. "So, what're you prepared to do for me?"
"Anything you want mistress" you say with a slight smile. "I am yours, to do use as you wish".
"So...if I wanted tooo...I dunno....pop you in my mouth and swallow you. You'd be ok with that?".
"Yes mistress", you say. "I am indestructable after all. You can eat me if you wish, I don't mind. I just want to give you pleasure".
"Cool", she says softly. "So..why did you ask for this? Why do want to be a slave?"
You quickly explain about you fantasies and dreams, and the way you've been feeling for the past few years. Porschia listens intently until you've finished talking.
"I just wanted to make sure this isn't something you rushed into", she says. "I think it's pretty weird. But I have to admit...I am pretty curious. It's quite erotic really, the thought of being able to have a shrunken human inside my body. My own brother".
"Would like to give me a try mistress?" you ask, trying to encourage your sister to do something with you.
"Yes," she says with a smile. "I need to satisfy my curiosity if nothing else. What do you thing I should do with you?"
"I'm just a slave mistress", you reply. "It's not my place to tell you what you should do with me. I will happily let you do whatever you wish with me".
"Ok then", Porschia says as she smiles and licks her top lip. "Since you really are so eager to please. You can be a be my little toy, and I'll be your mistress".
Porschia stands up and makes to go over to her large, walk in wardrobe. But she stops and looks down at you. She then smiles, with the tip of her tongue touching her top lip. She turns and stands in front of the computer desk you're on.
"How's it feel to be standing before a nineteen year old giantess?" she asks.
"It's awesome mistress", you reply breathelessly. "You're so beautiful. It's like standing before a goddess. I can't wait to start pleasing you".
Porschia giggles. Then she unfastens the button on her jeans before slowly pulling down the zip.
"Oooh, you like this, don't you..slave?"
At first you don't know what she means. But then you suddenly realise that you're naked, and aroused. You feel yourself blush with embarrassment. You're also somewhat surprised that she noticed.
Porschia giggles, and then softly says, "I think you'll like this even more", She slowly pulls down her jeans and panties, revealing her giant, hairless pussy, right in front of you.
You feel your jaw drop as you stare in awe at the giant slit that runs down between her thighs.
Porschia giggles as presses her thighs against the table and pushes her pussy closer to you. "Yeah, you do. I thought you'd like it".
She moves away and quickly removes her shirt and an bra, and then her jeans and panties, leaving her standing before you completely naked.
"So", she asks "Now how does it feel to be standing before a nineteen year old giantess?"
You're so awestruck by the sight of Porschia's gorgeous, naked body, you can't speak.
Porschia laughs, "Yeah", she says with a grin. "Now I'm your goddess. Are'nt I..slave?"
"Yes mistress", you say, wide eyed and breatheless. "You're my goddess".
Like before, Porschia presses her thighs against the desk and pushes her pussy toward you.
"Your goddess would like you to kiss her" Porschia says.
"Yes mistress", you reply as you walk right up to the enormous slit. You then lean forward slightly and slowly kiss your way down it as far as you can.
"Mmm, that was nice. I think I'll enjoy having a slave. Let's get more comfy".
You grow another two inches as Porschia picks you up and carries you over to her bed. Living in a large Mansion means all the rooms are pretty big, so it takes her a few seconds to walk to the large double bed. She sits down in the middle of it leaning back slightly on her left hand.
She puts you down between her thighs and and then puts her right hand behind her, so she's now resting on both hands. Her long blonde hair is tied into pigtails, which are draped over the front of her shoulders.
"So, my little slave", she says. "How do you think I should enjoy you, hmm? Should I command you to...stimulate me, with your tongue. Or should I have you rub yourself all over my pussy?"
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