Bringing your cock into the friendship will ruin it. Sure it will be great for awhile but in the end one or both of you will start pulling away. Human nature dictates that the remedy for regret is to cut it off at the source, that "source" being your friendship.
If you don't care if she stays your friend or not, do it.
BUT, if you value your friendship, dont let human weakness ruin it for you.
__________________
"The towers are gone now, reduced to bloody rubble, along with all hopes for Peace in Our Time, in the United States or any other country. Make no mistake about it: We are At War now -- with somebody -- and we will stay At War with that mysterious Enemy for the rest of our lives." H.S.T. 09/12/01