Transsexual
LOL - Now we are talking about busy girls, that you know, are packed most of the time.
Just call and ask the girl specifically.
As we all know - There are a lot of guys, that are fine, as long as the girls give them the hot time , kick ass-rock hard performance with or without "C". Those "gents" are happy. Their expectation are met. Super GIRL with A rock hard clit!
But there are some who demand "C", and really stressed it, and got pissed off if it doesn't happen!
With your fantasy, You surely will be one of these "gents" who demands "C"IM.
So, you should tell the girl that you desire, specifically and up front.
Some busy girls might do it if they don't have dates lined up ahead, so they can keep going. Unless if they are not busy at all - then you should have no problem.
And yes, if you are the last one of the day for the girl to work on, they should have no problem!
But if you are middle of a line of dates, LOL - I am affraid you have to take your chances.
Those busy girls usually will try to maintain their "functional".
Like I said before, there are a lot of gents who don't mind at all, As long as you can be as hard as rock and perform good and rocking hard, those gentlemen's expectation are met.
Now the questions for you to think of, are:
"How many bullets in one pistol?"
and
"How many gents that the girl see in that day?"
and
"What number of the gent are you in that day?"
Some girls have 1 bullet per day,
some have 2 bullets,
some might even have 3 bullets.
And the ones that are on hormones, tho' they might have bullet LOL, but they rather store it, so It won't defeat the purpose of the hormones.
Now you ask yourself,
How many bullets do you have in a day? 
Hope this will help 