How are you supposed to know when your cumming?

It's very hot for me to have the wife go off like that as she cums in my mouth during cunnilingus. I love to feel it rush out and all over my face and tongue. And yes most of it is pee, but a lot of 'pussy juice' makes it different. Sometimes I'll have my tongue right on her peehole when she cums and it's so fucking hot. Do it girl. Just let it flow when you cum.

“Squirting ” has been incorrectly labeled by many as female ejaculate that only some women are capable of achieving. It needs to be demystified and explained to reveal what it really is.
There have been studies to identify what the actual fluid that is expelled during what is called “squirting” is. Out of all the women involved, the fluid was analyzed and found to be urine. Some women actually lose control of their bladder during high levels of arousal. It is called “coital incontinence”. Some of the confusion comes from the fact that sometimes PSA is found in the urine, leading some to believe it is something else. The very low levels of PSA are due to some of the fluid released from the Skene’s glands during arousal, being mixed in with the urine. The Skene’s glands secrete a small amount of fluid when a woman is aroused providing lubrication for intercourse and sometimes a bit more during orgasm. These glands are located very close to the urethra, so it is to be expected some of it would mix with the urine.
The important point to note is that the PSA level in the urine expelled during arousal is very low, which reveals that the fluid isn’t just Skene's gland fluid. It is a very minute portion of the main fluid which is always found to be urine. Skene’s glands are incapable of producing the large amount of fluid that can be released by the bladder. At best they may release 2-3 ml. since they are the size of a pea. When women “squirt” it is usually described as being 100 ml of fluid or even much more. The Skene’s gland are physiologically incapable of producing this amount.
Even when women empty their bladders prior to coitus, ultrasound revealed a sudden filling of the bladder after sexual excitation and after “squirting” the bladder was empty again.
Some women go to the doctor about their “coital incontinence”, while others don’t mind and the partners don’t either, usually because they believe it is female “ejaculation” and should be considered as something positive. It is actually a pathological sign of a urinary disorder. It can be repaired surgically, or controlled by medication for overactive bladders.
So, for the women who feel inadequate because they do not “squirt”, realize that you actually have a healthy bladder and for those that do, a visit to your doctor is probably in order.

it'll just be like that for a while

it's normal and you'll most likely grow out of this phase in time.