>>52795355(You) have always been close with your sister, Lui. However, after you both left the nest and each went their own way in life, meetings grow somewhat irregular over the course of time.
You stay in touch, but with that much physical distance between you (she lives in Tokyo and you in the boonies or something) it's only natural that you aren't as involved with each other as you used to.
Luckily, there's a joyous occasion to bring the family back together: The announcement of your marriage/betrothal!
As you sit there gathered around the table in your old family home socializing, the old dynamics between your sister and you rekindle.
Realization soon starts to settle in as both of you can't help but think that your new wife/betrothed is nothing short of a second rate Luilui in every regard.
What do?
I'll tell you what. Forbidden incestous hawk-netorase is what to do. 