My life sucks but it doesnt i dunno

i am not old but i have a new family ime starting at least tring to restart,the lil hottie looks like her mom,shes almost of age i wouldnt touch her i would hope but im gonna tell you i dont sleep with everything and she fits into my bill exactly,i have talked with her lol,i have been through alot with this bunch i love them all but my feelings go way too deep for her she will be my stepdaughter,i would only want it once,men always want what they cant have ,and really bad when they know never,i have told her about my feelings she said to stop it i have offered her everything for a moment,that would be all for me i would still love her as much but the omg shes hot would die away and i would make a great dad,i know why she hasnt told moms,but i am the feelings where moms thought i did something and put me through hell and an affair and then found out i was faithfull,i want to her to screw my brains out nothing more,i know this is wrong and its a sin but i am in love with her truly this i am haveing problems with,she said no i have talked with her to no avail,she started the entire mess between her mom and i she owes me i think some satisfaction i want some anyway,i am a gentlemen and no is no i would never without consent but how is my question do i convince her to give it to me once,she loves me i know i can see itt but the guilt and awkwardness she said i dont htinkits an issue i think she thinks if she gves it once ill want it more but i know hell no once is good for me,please advise on what to do,i am not a freak ust in love with a mother and a daughter dam this is worse then cheating lol god i ask for help please