Help with sister

ok /lounge heres my problem, im 18 and my sister is 25. she lives far away from me and comes to visit rarely. she is truly gorgeous and she is always the object of my masturbation.i still live with my mother. any tips on how to seduce her?
btw she is only half sister

My step-sister offered to fuck me once for $60.  I'm being 100% serious.  I was 16.  She was 14.  I totally would have done it too, but I didn't have $60.  The next time she came over (my step-dad only saw them every other weekend), I had $60, but she wouldn't do it then.  She said she didn't need the money any more.  Bitch.