You are my sister's pathetic excuse for a fiancée and I am fed up with your holier than thou attitude about pre-marital sex and how "sinful" it is to masturbate.  On the flip side, you highly disapprove of my lifestyle and my obvious disrespect for traditional morals and values.  I make fun of you all the time to my sister's face, calling you a prude hypocrite and bragging about how I could make you rethink my beliefs in a heartbeat and that my sister just doesn't have the body for corrupting your weak mind.  Today I dared my sister to give me 5 minutes alone with you and she will see how truly 'holy' you really are.  There is one condition however, I can't mention anything about jerking off or sex or how good I can make you feel.  I just have to let my incredible body do the dirty work for me.  I know I have what it takes to get inside my head, even if it appears to you like I am seemingly unaware of the impact on your weak little virgin pecker.  No little virgin can resist my perfect breasts in a low-cut top or my sexy legs in a short skirt.  I don't have to conspicuously walk you down the path, I guarantee that just a little harmless, innocent flirting with my natural assets will have you little prick in for the tease of its life.  Effortlessly, I will prove to my sister that her beloved fiancée is a dirty, horny perv just like every other guy.