Finally, Sydney senses again that you are getting very close.
She then flips you over, having you enter her pussy from behind.
You are in heaven, but still desperate, trying to orgasm...
So then just as you start thrusting wildly, she tells you to stop:
"OK, stop thrusting now, just hold it in there!"
You try to use your PC muscles to start the flow of cum, but you can't get quite enough stimulation from just that.