Let's go with the all-classic:
You know you can use other appendages on her as well right? fingers, tongue, ...
Also, have her go down on you seems like a classic boost as well.
If all that fails, try a cockring? It's basically like tying a knot in your balloon, making sure you won't lose 'hardness'.
I'd think twice about pumping chemicals in your system that are rumored to work (and come with their own downsides). If they work 100%, some Pfizer-like companies will have a patent on it, rest assured.
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Moderation should be moderately moderated.
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