http://www.dlsite.com/ecchi-eng/work/=/product_id/RE110061.html

My mother died when I was young.
My father raised me alone, then married a young woman who herself had three daughters.
However, those daughters and I just didn't get along. Our relationship was eggshell fragile.
"It's really too bad. I wanted to become a true family..."
So I put a plan into action.
I bought a powerful aphrodisiac on the internet and spiked my new sisters in law.
We'll be a family yet.
For fans of harem, incest and mind control!

Base +9, Terrova +4