Is it normal that i sexually desire my adult step daughter?

Hi I'm 43, Handsome dude, no own kids. my wife is 59, she married 3 times before. We live together for 17 years. My step daughter from her first matrimony is extremely hot woman she's 29 she was an international model and ex cheerleader too. She has 5 kids from differents ex husbands, but now she's single and her last fiancee is in jail. I always has a sexual desire through her not because she always being hot. But also she's intelligent too. She love me to give her a massage when my wife is not present and force me to touch her neck somentimes, I guess she Really likes me too. But somentimes she act weird on me. because She also wants me to buy her food and I let her steal me money somentimes. But lately I have a strong sexual desire through her. Is that normal? I guess yeah duh. I believe to be universasl and natural in this free world without causing hurt to no one, without causing trouble. because I desire her sexually so bad. That u don't even imagine how bad I want to have a sexual relationship with her. And I'm not planning to live my wife. Anybody can give me an advise to get her faster in bed?. Please. Thx. Pepelepu.