Horny Drunk Sister

I made two mistakes last October, first I picked up my sister she was drunk I could by her voice on the phone. Second, I took her to my place instead of straight home where she still with our parents. Who were away that weekend anyway, my sister is 21 and I'm 24 both average in looks. My sister has a great rack and on arrival at my place said straight out she was really horny. Then adding she was on the pill and protected against getting pregnant. So, I believe her and her willing to fuck even me was too good to pass up. Turns out she had missed taking her daily pill three days running. She is now pregnant to me, upside she can't get more pregnant than she already is and she is now living with me and sleeping with every night. Lest I could do is take her in when my very Christian parents threw out for getting pregnant outside of marriage. The doctors say the baby is healthy, so I'm to be father to my sister's baby thankfully unknown to my parents. Who control my trust fund until I reach 25 this coming June, my sister still has hers and has to wait till she's 25 in late 2029. They only administer the trust funds and cannot change the conditions. My parents aren't too happy with me helping my sister, who they say she disgrace the family name. If they knew who the father was, they would go out of their minds.