Lolikko Kunoichi Boshi Soukan ~Futago Doujo no Inmitsu~

The triumphant return of lolita ninja Sakura!
This time is an incest love triangle!?

Some years after the sexual wars...
Sakura the daughter has now become a mother.
Her son grows up quickly, and is quite a handful.
Amid these days, she has a nightmare - a terrible vision.
When she awakes, her son is gone. She searches
into the next town, chasing glimpses of his figure.
Along the way she discovers two naked girls.
Stricken with sympathy and pity, she saves them, and
after hearing their story, offers to bring them home.

That's when an all new obscene life begins...

From English DLsite