Cool FWB I Fell For, But She Brought Her Busty Big Sister Along

The peaceful city of Mikura is suddenly thrown into chaos by a zombie virus outbreak.
Amidst the disaster, Raita Kawakami and his wife, Mie, struggle to survive.
But as desperation sets in, Raita is forced to make choices he never imagined...
 
A game featuring hidden perspectives (NTR).
Each day is divided into three periods: morning, evening, and late night, allowing you to plan and decide your actions freely. You can explore alone or take your wife along, though doing so might consume more resources.
Unlike many other games with date-based systems, major events in this game are not strictly tied to specific time points. You can choose to ignore exploration entirely and stick to basic resource collection for survival, or focus on the main storyline and uncover the truth.

Sister Repays Loan with Her Body

Hibiki turned into a girl because of his/her scum-big-sister's wish.
S/he was first hesitant to perform jobs in the guild, but
nowadays s/he is getting used to it and kind of enjoying it.

One of these days, she has got to go through a new mission......
In this moment, Hibiki's fate is linked with various encounters.

In Urunka village, there's a busty sister— Eruna.
One day, after receiving requests for assistance from other villages, she left her hometown and went to "Adus Village."
She was given the task of guarding the "Succubus Rhaenys" who had been sealed in the village cave since ancient times.
Eruna came to the cave and found an old book in the depths.
When Eruna approached, the book suddenly released eerie shine, and the sealed succubus was freed.
Even though she tried resisting, the succubus still entered her body, almost possessing her.
Eruna was then saved by her fellow sister, Aela. However, the succubus still remained in her body...
Then, to resist the uprising desire under the influence of the succubus, she needs to drink “a special love potion that suppresses the succubus,” next, she has to endure the horniness, which is the side effect of the love potions, for "Seven Days."
Of course the perverted men in the village will not let the busty sister have it easy...
Eruna is about to begin her lustful seven days...
【Features】
Eruna, a gentle and kind sister who fulfills her duties in a rural village and the side character, Aela, a sister in the church of Adus Village.
The two sisters have to hold back the overflowing lust because of the succubus while fulfilling their duties and seal the succubus again. "A short RPG about sisters enduring lust and avoid erotic things.
・The homeless middle-aged man who lives in the village without permission and always tries to approach Eruna.
・The weird middle-aged man who runs a alchemy store and develops H○rny potion.
・The young bar keeper who keeps making Eruna drink despite her inability to handle alcohol.
・The old village head who asked for Eruna's body as the payment of helping his village.
...etc, they are trapped in the lustful spiral and involved in the incident around Adus Village.

Minase Haru was in love with the the school's idol Minase Kaoru, who also happened to be his older sister. However, in spite of that, he just couldn't be honest with himself and regretted it every day.

Due to a certain event he found out his sister was actually his brother, cross dressing.

"But I loved her even though she was my sister!"

After hearing that Kaoru accepts all of Haru's feelings........
And the two throw away the boundaries and flirt with each other endlessly.

Where exactly are the siblings going?
To go have sex in cosplay at school of course.

Haru gradually awakes to the joys of traps......