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I am assuming that Katarina does have access to the semi-official cantrip that our games have been operating under, which will allow a man to orgasm more than once in any time period, as well she can do this....
A group effort is not an issue for me, but you might find that I have many ways of giving you vigour that you never knew you had. And giving you an erotic massage that lasts for that long just as a starting point would certainly begin to charge me up.
It seems that Quinn finds the terms acceptable, or at least hasnt walked out yet, so without further ado, Katarina takes a pen and signs her name to the contract, offering the stylus to him after she is done