Üvey erkek kardeşim hayır demiyor

Finally on holiday! My new Japanese stepsister is nice, but I can't understand a word she says. She smiles at me politely, but I'm not sure why she's observing me so intensely. Sometimes it makes me feel shy, and since she has a nice slim body it also makes me feel a little excited. Maybe she's noticed because she came into my hotel room after our arrival