SIDE STORY TO MAIN
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have more to tell and do with it, but this side thing has been taking up space on my desktop for a while so i am tossing it up.
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World and Setting:
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This is a typical thing in Kanistan, as they share a lot of the same laws and religions of Servidia, as discussed in https://e6ai.net/posts/23223

Some of the fiefdoms in the Kingdom have some different conventions to this. To insure a more balanced population and prevent out of Binding Ceremony offspring, any offspring regardless of status, is put in chastity belts/devices at age 10 or sooner if they show signs of puberty. Symbolically, a mother will hold the key to the chosen male child's belt, and the father to any female or classed as female offspring. Upon a Bonding Ceremony and as part of the Committing as a new couple, the mother of the male will present the key to his soon mate, and the father will present the key to the female or classed female. Casual nudity is common in the home here, and while not frowned on in public, it is usually practical to be wearing garments.

STORY:
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"Brother! Brother! I found moms key!", sister said as she rushed into the study.

"what?" was all I could muster for a few seconds while trying to process this. "Dad and Mom just left yesterday for a weeks trip and you were already snooping around her things?"

"I" she stammered, looking down. "I was trying to find her Bonding Ceremony dress. Its so pretty, and I wanted to try it on since when I turn 18 next year and I can be open to be Bonded, well, I wanted to look pretty in it for now, if for just a few minutes and my dreams."
"After all," she continued, "next month you are free to search and choose a mate and that's a given you will do so. Me, I have no hopes or interests for me I know of."

I looked at her with my head cocked, "Ok" I said. "I know both of us are wanting, well, that. Especially since dad and mom are always mating. I mean, I can surely hear them through the walls and I am sure you can from your chamber. It sounds so joyful and loving and, pleasurable."

Her turn to cock her head at me.

"Remember that time last summer," she said, "when we came down for first meal, and the glance and mutual nose wrinkle we gave each other, confirmed they had probably been mating in the kitchen, even with the eggs cooking, you could still sort of smell it."

She giggled after a few seconds, "I think it got into the eggs..."

"Eww!" I exclaimed, giving her a playful punch to the arm. "I know your right but I wanted to forget it."

She sighed, and held up the key again. "Brother, we know we want mates, we have been constant witnesses to just how pleasurable and loving the act is but never experienced it ourselves yet. You will soon but me, I do not know."

My jaw dropped and muzzle opened, but could not speak.

"Brother," she continued, "Lets take this week and learn how to make love to a mate, how to make each other feel, and how to..."

She paused, dropped her hand with the key to her side.

"How to share the gift, equally."

I gently grasped her hand with mine, and plucked the key out.

"Did you find moms dress? Put it on..."