19 Years old Girl; I am in love with my step brother, what do I do?

my name is Anabel.

Ever since my Dad got married to his mum I have not been able to love someone else. Anthony and the mother moved into our home immediately after their traditional wedding. The first time I met him I was only 14 years old. Though I liked him so much, I never thought of having sex with him. two years ago during an outing with him and his girlfriend to mark his 21st birthday I was for the first time very jealous of their relationship and since then I knew I was attracted to him. my attraction for him grew worse and I could not control it any more. Once I sneaked into his room when he was asleep and tried to play with his body but he woke up and held me back and also threatened to report to our parent.

I tried several times but he kept pushing me back each time. I became obsessed with him that I decided to start seducing him.

I did that for two weeks and by the third week he was not able to hold back any longer. One Sunday, Anthony could not go to church as he had exams the next day, I left the church early to seduce him at home, when I got home, He was on boxers in the sitting room, Immediately I started to undress right there, he acted like he did not notice me but soon I noticed he was getting hard so I moved closer, he tried to walk away but I held him back and by this time I was left with only pant and my bra.. though he was trying to resist me, I reached out for his organ and before he could resist it was already in my hand and mouth, I made him moan and desire to have sex and finally we had it there in the sitting room. Ever since then, he sneaks into my room every night and we engage in good sex. we have been doing this for eight months now, I am no more attracted to other males, my step mother caught us last Sunday while we were kissing but he was able to convince her that it was just a peck, The next day she advised the two of us and asked us not to do anything funny but the problem now is that I am deeply in love with him... please what do I do? Do I continue the affair?