I have a room right across from my sister and we share a bathroom. who is only a year older than me, she is always around me half naked, what do do?

I have a room right across from my sister and we share a bathroom. who is only a year older than me, she is always around me half naked, what do do?

She leaves her bras an panties in the bathroom all over, in the house (Upstairs) she walks around in bras and panties, she even asks me to hang with her in her room... She dates guys but can never keep a boyfriend for too long.. When she has boys over she leaves her door open.. she keeps joking about Incest... I have been polite and not stared but there is only so much a guy can take, I told my dad about it, he said to leave it be, he said if I told my mom she would accuse me of being a pervert... and My sister TOLD me to take this picture of her for her boyfriend she just broke up with.
I have a room right across from my sister and we share a bathroom. who is only a year older than me, she is always around me half naked, what do do?
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