would you rather she should be, I imagine they'll be explaining her backstory and how they came to be siblings like they did in the episode after the revel in the anime
You got Sayuki with heart eyes proclaiming her undying love for you and MC is still like “boy my sister who I sleep in the same bed with really gets me going!” Smh
This vanilla bitch is so afraid of fucking the totally hot and horny senpai, your vanilla ass would be bored after your guilt inducing pseudo incest sex with your damn sister