To take this even further, and many people have said this before me, why even "come out" at all? Why not just tickle her, see how she likes it, and keep working from there? Unless she's a complete idiot, she'll quickly get the picture that tickling turns you on. And you'll avoid ever making it a big deal, which it isn't. Eventually the time may come when you want to talk about it, but since you describe her as "this new woman," I doubt that time is now.