Kiryuu Ayako

The first love of the protagonist, and is a long time acquaintance to the Kiryuu household.

She fell in love at first sight with the older brother Eiichi, then married him soon after. Also, she treats Shinji like her real little brother.

Her kindness doesn't discriminate, and she also shows her husband the utmost respect by not talking back to him. She wants to have a baby soon, so she has sex with her husband every night, but even so, she still hasn't experienced orgasm.

However, after she first tasted the pleasure given by her younger brother's penis, she started to become aware of her lewd side. Trying to protect her fidelity to her husband, she desperately tried to resist the pleasure, but...

"Your sister's body will be the collateral, so please, I ask of you to finance our company."