As you are about to visit the kitchen for a morning coffe, a familiar girlish voice made you jump.

"Happy birthfay!" Your wife's sister threw herself on your back.
"You are a week off, Aki!" You answer trying to shake her off while Yui, your wife, laughing with you.
"I know, but it would be too late on your birthday! You won't have time to enjoy…you know, the present."
"Present?"

Aki releases you from her grip and stands before you. You wonder why she has her cheerleader uniform on her. And…did her breasts grew up?

"I know you have a big party, and 30 is a round number. That's why I gift you…myself! I have grown big enough to make a good roast…and to make you feel good too, while we prepare for it."
"She even kept her virginity for you." Yui speaked up. Looks like morning coffe going to be late.

Yui agreed to help her sister to lose her virginity. Girl was really popular in her school, but she turned down all of the boys, and had no sexual expiriance whatsoever. As Aki walked up the stairs, she flashed you her ass from under her skirt: instead of panties, there was a red ribbon wrapped around her.

Aki was lying on your bed, her t-shirt pulled up, revealing young firm breasts. You lift her skirt, revealing red ribbon concilling Aki's gift. You slowly untie it, while girl starts making out with her sister. All of you shed your clothes.

"Are you ready, sweety? It will be just a little bit painfull, but then it become really good." Yui said, holding her sister's hand. She even prepared a camera to make a home video.

Sister nodded. You start to tease Aki's lower lips with a tip of your cock, slowly inserting it in, then penentrating through the resistance with a big push. Girl squealed, bending her back, wich emphasize her breasts even more. You reached to Aki, kissing her on the lips. She answered with an embrace. As Aki's legs started to shake with her first orgasm, her tight pussy squeases your dick the way your wife's didn't squeased for years now. You finished kissing Aki, and gave some attention to Yui, and then, after giving her second orgasm, you shot a strings of cum over her belly, breasts and even getting some on her face. Aki lay down breathing heavily with an expression of a pure bliss. Later, on evening, Aki helped you satisfy your wife, who held her lust from watching you deflower her sister for all day. Yui taught her how to use her mouth to satisfy a man, and you showed her how same mouth can be used to satisfy a woman. She struggled at first, caughing and choking on your dick, but Yui was a good teacher.

On the second day, you woke up from someone trying to take your dick in your mouth. You recognize Aki and decide to pretend you are still sleeping. When she gets frustrated that you won't wake up, you suddenly put a hand on her head and force her to take whole lengh.

"Hey! - she screams after a caugh - Don't choke me before your birthday, silly! I woke you up because I wanted to try something."

Aki climb up on you. She had only unbuttoned pajamas on her. The bottom layed on the floor besides the bed. She started to inserting your cock into herself. Then started moving. You watched her amaturely ride you listening to her soft moans as she moved her hips up and down. Just like your wife did after you married.

"I will cum inside you. You don't mind?" You ask.
"Y-yes, please…fill me up! I want it inside!"
Aki shakes in extasy, as you pump your seed in your future party roast. You regret you didn't got the camera to record her words, but you sure you will have a lot of opportunities.
Right after, you and Aki went in shower together. You put her against the wall, and worked on her anal with fingers to stretch it a bit. Then you gently took her anal virginity, as she begged you not to stop.
Days three and four you was pretty buisy on your job, but you still managed to get some good time. You tried anal one more time, pulling her hair, you ate her out while Yui was sitting on sister's face and you facefucked her under the table while eating your breakfast. Every bit except last one (due to Aki being extra sneaky today) caught on camera for family archive.

On evening, you did preparations for your birthday party with your wife.

"Aki had a crush on you sence childhood, you know? She kept her virginity for you personally."
You were about to answer, but got interrupted.
"And I see you getting along with her. - Yui made a sweet smile - That's why…I won't be mad if you decide to keep her as your wife and roast me on your birthday."
"Honey, as much as I would like to try that cake, - you slap her butt playfuly - It would be a shame to turn down Aki's offer. If you want to be roasted, I can get you on the next year."
"I know, but I'm not getting younger. My meat won't be as tasty as Aki's younger body, but it would only get worse. Aki had sex with you on every possible opportunity because it was supposed to be last weak of her life. You already gave me years of happy life. I would gladly end them to make you, and my dear sister, happy."

You had a free days until the end of the week. You still weren't really sure about who should you roast on your birthday, so you wanted to talk about it with her.

"Wait…what? I'm not going to be roasted?"
"We not sure yet, - you calm Aki down - That's why we telling you."
"But that means…"
"That means you will leave with my husband, sweaty." Yui gently touched her sister's face, as a tears of joy started to run over it.
Even if it was your birthday, Aki was even more happy then you do.

Meat should be prepared beforehand, so Yui will be butchered on day six. As a goodbye party, you descided to rewatch your home videos. Setting camera on herself, Yui started with Aki's losing virginity. At first watching her masturbating, you and your future wife helped her get a several orgasms caught by camera.

When the time comes, you for the last time meet your wife. Naked, clean, ready to be butchered. She looks nervous, but excited. As you lay her on a chopping block. You gave her one last orgasm before putting the axe down on her neck.

On the birthday, you not only presented everyone your current wife, as the main cource, but also your future wife. Yui's skin had beautiful bronze color, not even mentioning the smell. You kept her pussy steak to yourself. It's your wife, after all. You also kept her head, making it as a decoration on your birthday table and preserved as a toy. You promised Aki that when she gets past 25, you will roast her too.
————–
Name: Numbers 108 and 109
Age: irrelevant, appearance on 16-18
Characteristic: emotionless and subordinate, but curious. Have no will to live once their mission is complete, but want to learn about sex before disposal.
Setting: 108 and 109 are clones grown for goverment spyonage with implanted skills and memories. To keep secrets sealed, meant to be recycled after mission, but asked for a bit more time together before disposal.
Preferences: dissolve them in solution shover or tanker, as they exolore each other. Might add self-degrading talk about their disposable nature if you are into that.