Dieselmine - Sexing Up the Moodswing Cousin and Devilish Niece: A Sex Ed Pregnancy Story

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Yui Minase (Cousin) CV. Yotsuba Tsuyuri
A moody student committee leader with straight black hair.
Her parents are overseas so they put her with you for safekeeping.
Serious to a fault, Yui is easy in terms of babysitting, but her
big breasts and natural intellect mean she's constantly
bombarded by horny guys and sometimes a few girls.
Yui refuses to date because it's "impure". Her hobby is
girl-oriented comics, and she yearns for a love like in those.

Alice Shijou (Niece) CV. Mafuyu Hiiragi
Mixed race and provocative, she's the daughter of your brother.
She has silver wavy hair that she wears in twintails.
Your brother's caught up in work and can't care for Alice for a few years.
Now she's with you. And she's a devilish one.
At school she likes to exploit her many admirers like servants.

Hideo Shijou (Protagnist)
A late 20s freeter / part-timer.
No girlfriend, lots of time spent gaming and working.
His personality is particularly stubborn.