Act first date dating old friend
By not being so dependent on whether or not that friend wants to date you, you’re going to avoid “needy” behaviors and naturally come across as confident and attractive.
Using sexual innuendo for example, will bring sex into the conversation in a fun, playful way.
You can also ask her about her dating life and openly talk about your own.
Just be sure to keep the conversation light (otherwise you risk become her “therapist”) and positive (i.e. Talking about your dating life and how none of the girls you’ve met have measured up can then be your segue to expressing your desire to date her.
She’s got to get used to this new way of seeing you.
If you try the tips above and she doesn’t go for the date or doesn’t want to be kissed, just take it in stride.