The most cum my wife has had inside her was from a time she took 19 men in one night. All went bareback and shot their loads as deep inside her as they could.
While this picture does not show how much cum there was, you can still see it on the current guy's cock, balls, and leaking out of my wife's pussy and down her thighs. I can tell you each guy after the second pushed a lot of cum out with their thrusts before they added their load.
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This guy was like number five or maybe six and I got his snapshot as he entered her, after a few of his thrusts his balls were covered in other men's cum and he added another load.
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Judging from our experience, all the guys we have played with seem to love seeing a pussy filled and leaking cum loads, their own or other guy's loads. Once the play begins nobody is squeamish about contact with other men's cum loads.
After several men, my wife will literally leak for several days. She says the female vagina is a muscle and designed like an Accordion. She says the vagina expands during arousal to accept larger size cocks and then after climax, the vagina will contract back to its normal size and this leaves folds of muscle tissue that hold cum until it is naturally expelled.