She will let you know when she's ready to transition to intercourse. If you want to take charge then just let her know that this train is going all the way to the last stop. At that point she might let you know pertinent information like being unable to climax from oral. The point is communicate it never hurts to be generous in bed though, as long as you are enjoying it.
I think you should finish with mouth and fingers, and nipples before you enter. women can have many orgasms!
Since I usually only cum from oral, if somebody stops before I have climaxed in order to have sex, I would be very deeply disappointed....it's the surest way to make it even harder for me to orgasm in future times, because then instead of enjoying myself, I wonder if they are going to stop short.So unless you are willing to go the extra mile, I would say, go all the way, or don't do it at all!
Since the Human Brain is the largest erogenous zone....it is more about placing your lover into a state of mental expectations and sexual thought. Physicality is secondary. TooReal