How to Break Up from friend Sis....!!!?

I have this girl sister of my very close friend... I don't understand when did this all started, but than one day when i was at my friends place, his parents were out and he went to bathroom his sister was their with us in the room, i was just mocking her with some TV drama, at first she got annoyed but than she held my hand and said to me.';Please don't say that';, i was like amazed, and than when i said, Okay (in confusion) she kissed me, not just that on, lips and i lost it, (my fault i know it).. And we start doing stuff on that day only as he(my friend) had to go out for things... but after that day am feeling bad it feels like i used my friend and now am hitting on his sister.. I tried to break up from her but her sexual ways don't let me opt out.. Believe me i never did anything with her after that day and its like a month since i went to his house and now she told me she told her friends i am her boyfriend... Please help what to do and how to get pass her over time sexual attraction.. Please i cant bear it anymore...How to Break Up from friend Sis....!!!?
WOW that's kind of tough. The first thing I would say is don't try to hide it from your friend. He is going to find out sooner of later and if you hide it from him its going to make things worse. Tell him and maybe he can help you tell her what happened. Then it will all be ok. Good luck.

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