Im being sexually blackmailed by my teacher and im in a bad situation.?

Ok, im 19, currently in college. And one night, last week. me and my teacher, we were at a sort of college disco at a night club. And my parents were also out. I had no ride home so my teacher gave me a lift back to my house. And there was no one in. So i rung up my mum on her mobile and she had broken down... show more Ok, im 19,
currently in college.
And one night, last week.
me and my teacher,
we were at a sort of college disco at a night club.
And my parents were also out.
I had no ride home so my teacher gave me a lift back to my house.
And there was no one in.
So i rung up my mum on her mobile and she had broken down in her car, about an hour away out of town,
so my mum asked to speak to my teacher and my teacher said it was ok for me to stay at her house until my mum got back home.

So i went back to her place.
And we just talked.
And we got laughing and giggling and had a few drinks,
and she kissed me.
I didnt think much of it and i laughed.
And then she kissed me again,
and i dont know what i was thinking,
but i kissed her back and we starting 'making out', as the americans would call it.

And we started getting serious,
she started un-buttoning my shirt,
but then i came to my senses and pushed her off me.
She asked what i was doing.
And i told her i didnt feel comfortable doing this.
She was angry and told me that if i didnt have sex with her,
she would tell my parents that i tried to take advantage of her.

I thought that this was rediculous,
but she had bite marks on her neck, so i realised i was stuck.
She also had a bruise on her arm that had be caused by a fall she had earlier in the night.
So realising the situation, i thought it would be best in the long run,
to just do it and get it over with.
So i had sex with her.

And when we had finished, about 5 minutes after my mum called and said they were home,
so my teacher drived me home.

And the next week back in college,
after my geography class,
she asked to see me after class.

Believe it or not i dont care,
she told me she wanted more sex,
and that if i didnt do it with her,
she would just tell people that i raped her.

I told one of my friends and he said i should just tell my parents and the police.
But if i do that then she'll just tell them that i took advantage over her,
and seeing a she has marks and bruises on her,
and the fact that we were alone in her house at the time,
the odds are against me,
and i cant prove that she was blackmailing me
and she has false, but convincing evidence that could send me to jail for rape.

what can i do?
Update: lie detectors arent always accurate
Update 2: OMFG CAN SOMEONE PLEASE READ THE F ING DETAIL FIRST!!!
Update 3: ILL SHOW YOU HOW FCKING SERIOUS I AM

I DONT WANT TO HAVE SEX WITH MY TEACHERS ALRIGHT!!!
GOD F1KING DAMMIT!
Update 4: SHE is 28 years old,
i think,
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