I do as Amber says

I take the bundle as I look away from her gleaming blue eyes and almost miss her biting her lip before I try to close the door but she puts a pale manicured hand on the door, "I didn't tell you to shut the door."

Quickly stepping back I try to head to the bathroom only for her to giggle, "Nor did I say go to the bathroom, change!"

I flinch at her shout and set the bundle on the bed before starting to head to get my trunks and again earning me a reprimand, "There's a suit in the bundle, change into that, or are you saying my choice isn't good enough?"

I shiver and spare a glance, I can swear she's grown again and her nipples visible through her top, before sifting through the bundle and pausing as I find the "suit" she had chosen for me, a bikini bottom, though a rather vanilla set it is without a doubt a woman's bottom. I give another glance at her, now with her arms crossed and foot tapping.

With a gulp I start to undress, only glancing back at her once and seeing her briefly touching herself and once I start to put the bottom on she speaks,"Turn around."

Shivering I obey her keeping my hand firmly over my rapidly hardening cock and a quick glance reveals her biting her lip hard, "Now, put it on."

Pulling my hands away from my girthy erection I try my best to keep it in the bottom as I put it on, but it's impossible to do and I settle on keeping it sticking out till it goes down, but once Amber turns to reveal a large toned ass I doubt it's going to calm down any time soon and especially as she seems to relish in teasing me as I follow her down.

We can hear Mommy even before we find her screaming into her phone as she paces around with a mostly empty glass of wine and wearing a pink fluffy bathrobe. Even Amber pauses a moment and surprisingly grabs my hand as we try to sneak past, but to no luck.

"Hold it...no not you Rosa! You better be here in 10 fucking minutes or I'll have you deported and charged with stealing my necklace." She screams into the phone, likely deafening the housekeeper dad hires before turning to us "What do YOU think you are doing."

"I needed a pool boy and you told me I could borrow-"

"Not talking to you, sweety. John," She shushes turning her attention to me and taking a long sip from her glass, spilling most of it on her exposed tanned breasts.

"A-Amber-"
"You are still grounded, till your father gets back you will call her Mistress!"

"Y-yes mommy." I squeak out before she gently cups my crotch.

"Hmmm. You know they're saying now if men don't use these they get all backed up and become women, do you want that John? Do you want to be my little slutty step-daughter."