Miia's Room (1.00) by Kira Tama

An old guy (the protagonist) got evicted from his apartment for failing to pay rent and found himself out on the streets.
The only person he could rely on was his older brother... But as bad luck would have it, his brother and sister-in-law were just about to leave on a 30-day overseas business trip! The condition for letting him stay in the house was to take care of their only daughter, a gyaru named "Miia."
"To think I'd end up living together with such a cute niece... Can I really keep my self-control intact for a whole month?" And so begins a 30-day cohabitation between a plain, unremarkable but sexually-obedient middle-aged man and his cheerful, free-spirited gyaru niece. Will the goal be getting her into her dream university, or a secret relationship that can never be revealed to his brother and sister-in-law...? While paying off his debts and resisting (or giving in to) his stirring desires, enjoy your shared life with Miia!​

2D Game, 2DCG, Male Protagonist, Big Tits, Creampie, Sexual Harassment, Sleep Sex, Vaginal Sex, Point & Click, Oral Sex, Censored, Clothes Changing, Virgin, Paizuri

1. Extract and run.

■ A 30-day life system that tests your rationality
The program lasts 30 days,
with each day consisting of three sessions: morning, evening, and night.
Morning:
Mia is out at school.
During this time, you can earn money through part-time jobs or secretly rummage through Mia's room and take some of her personal belongings.
Evening:
Mia is usually home by this time.
Try to improve her academic ability by teaching her, or increase her like ability through conversation.
Night:
A chance to peek into the bath! If you're lucky, you might even be able to get your hands on some of Mia's personal belongings.
Also, when Mia is napping on the sofa!
That moment is the "special uncle time" when you can make your everyday fantasies a reality. Unleash
all the desires you have packed into your crotch, saying with all your heart, "It's your fault for being born in such a sexy form!
Thank you, big brother, I'll make good use of you, ugh!!"
■ Managing the "lust gauge" at its absolute limit
Interacting with Mia will gradually increase the old man's "lust gauge" (sexual desire). Be careful, because
if the gauge fills up too much, he may become unable to teach you or have a proper conversation due to impure thoughts .
Should I secretly handle it alone and calm down, or should I take the plunge and ask Mia for help...?
Controlling my desires will determine the course of my relationship with my beloved niece.
■Multiple endings that change depending on academic ability and level of promiscuity
The final ending branches based on "academic ability (university acceptance/rejection)" and "the balance between affection level and lewdness level."
From a pure love route where he diligently guides her and leads her to become an "elite female college student,"
to a route where he lets her become sexually unrestrained, leading to her degradation into a "bitchy unemployed woman" and mutual dependence, it
all depends on the older man's actions.