4chan at its finest

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So no. I' m in need of some serious advice that I cant exactly get in person...
My sister recently turned 16 and has been hooking up with some guy apparently. No relationship, just fuck buddies. So I know she likes sex. No relationship bullshit.
Keep in mind I' m 21, and a dude. Of course. I live out on my own.
Her and I talk about her doing stuff, breast size, but never any pictures or any specific details. She recently sent me a message asking me for advice on how to suck a
dick, and like what feels good. I took this as she wants my dick, so I told her I only know how to teach in person.
That was a no go. Got into all this "you' re my brother" crap. But yet, she still tells me about her having sex with this guy who' s moving in about a month, and I told her
already I want her to suck my dick.
How can I convince herto do it??
Put peanut butter on it.