YOU SAID:

Lets get off together by watching your sister

INTO JAPANESE

お姉さんを見ながら一緒に降りましょう

BACK INTO ENGLISH

Let's get off together while watching your sister

INTO JAPANESE

妹を見ながら一緒に降りましょう

BACK INTO ENGLISH

Let's get off together while watching my sister

INTO JAPANESE

妹を見ながら一緒に降りよう

BACK INTO ENGLISH

Let's get off together while watching my sister