Auctioned on Valentine's Day

We start at an auction, but I've decided to buy her for life.  She's got curves that have never been touched,  A body that begs to be claimed,  She's innocent, naïve and needs the money.  I'm filthy rich, and all I want is her - no matter what the price.  One night with her, and I realize, it's not enough.  But then she runs away...  I want to be her happily ever after.  And when she answers that one door I knock,  I realize...  Sh*t...I'm her new stepbrother!