Back in 1982, the School Beauty Asked Me to Do Multiple Choice Questions

(Multiple heroines + rebirth + era + space + richest man) There are many works with female protagonists. If you mind, please turn around! One day, the most beautiful school belle in the school said to the male protagonist: "If, I mean if, if my sister and I both like you, which one will you choose?" This kind of multiple-choice question is really a bit difficult. If you are a person with high emotional intelligence, how would you answer such a question?