It's common for siblings close in age to experiment sexually with each other, actually. It's taboo of course, but there's nothing wrong with it; it's a chance to try new ways of experiencing sexual pleasure with someone you trust in a safe environment and you should consider without guilt whether that appeals to you.
However, if she's making you uncomfortable and you aren't interested, you should tell her so and insist that she stop. It's not normal for her to persist without your consent
IIN that my sister masterbautes while I'm in the room
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It's common for siblings close in age to experiment sexually with each other, actually. It's taboo of course, but there's nothing wrong with it; it's a chance to try new ways of experiencing sexual pleasure with someone you trust in a safe environment and you should consider without guilt whether that appeals to you.
However, if she's making you uncomfortable and you aren't interested, you should tell her so and insist that she stop. It's not normal for her to persist without your consent