My Sister Is A Superstar

I can't believe it! Despite being non-biological siblings, my sister is an idle and conniving seductress? In addition, she intends to achieve greatness, but I am in possession of a potent mechanism that can assist her in obliterating any hurdle! Whoa, hang on, what is this? Even though I haven't excelled in that field, my folks want me to aid her in finding affection? That's unjust! System, do not dare propose that we become romantically involved. I refuse to be my sister's brother and brother-in-law!