Help: I Slept With My Dad, What Should I Do?

Hi Admin, am 20 years old girl. I got attracted to my real biological dad when i was 15 years and i felt like sleeping with him. 
I don't know what caused that coz he's not so handsome. I tried to seduce him but as my dad i found no possibility. One day we were alone at home and i dressed in a mini skirt sat opposite him with ma legs open. 

When he saw me he looked up the roof and i saw his trouser moving up and down i was winning him! But unfortunately my mum arrived and my mission failed. Yesterday my Mum and my two brothers were not at home, they had a visit somewhere. 

I cooked food and gave it to dad and i wore the shortest min-skirt ever. My dad looked at me uncontrollably. When we went to house, i had removed ma bra and i ran to his room claiming that am making his bed since mum was not there. 

He grabbed me in the waist and without resistance i fell on the bed. We slept together till morning and we did it and dad promised to keep taking me to lodges and we enjoy ourselves. Now when i saw my mum coming i felt guilty and i don't know what to add on advise me should i keep on with my Dad or i stop? 

Thanks.