My first taste of the combined fluids was not quite as dramatic as your attached photo. I'm not sure I could've started with that.
It was after she came home from a visit with one of her lovers and complained about how sore she was. I offered a tongue bath to which she replied I should wait until she cleaned up. I told her I would rather she not. A wicked grin told me she like that idea.
This started a routine. Cleaning up an hour or two after their sex is no where near as fresh as displayed in your photo, but it is probably an easier start for a newbie.