It's not illegal to fuck your sister if she's not actually your sister. DISCLAIMER: You can fuck your sister if she's not your sister, but not if your sister that's not your sister is your younger sister, and/or she is in high school, or if your sister that's not actually your sister is secretly...
The beginning of a harem story, except for new girls don't keep getting introduced whenever the main couple starts getting close. Pseudo Harem is the best.
One minor critique (but I'm getting this for free so I don't really care), it's kind of weird how Chiyo always calls him "Dear Husband". The translation is probably correct, but I think it would flow better if it just said My Husband.
Just wanted to make sure it was clear, BITCH IF YOU EVER SPEAK TO MY BOY AGAIN I WILL CUT OF YOUR EARS AND FEED THEM TO MY PET COUGAR AND THEN FORCE FEED YOU THE LIVE COUGAR AND HAVE YOUR CHOKE ON IT AND THEN-