She does it for like 15 minutes and "it" never happens. So her arms get tired and she quits. It leaves me cranky and often unsatisfied. I know how to solve the crankiness, but I do not want to finish – or even start, for that matter – in front of her. What can I do, if anything, to ejaculate quicker when she masturbates me?
I suggest you try to get over your inhibitions about masturbating in front of her. Unless she can develop an awful lot of patience (and arm stamina!) she may never be able to give you an orgasm by hand. You could try going for a long time (like more than a week) without so much as touching your penis, which will probably make you more sensitive and closer to a quick orgasm than usual. But I think you're better off working on those inhibitions – they're exactly the same inhibitions that are keeping you from ejaculating in front of her at all.
Do you find yourself masturbating more often during some seasons than others? Why?
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