There are several options open to you.

1. There are erectile inserts you can have put into your dick
to perform the function of the erectile tissue. Safe and it
means you can play for hours.

2. There is a vacuum pump which can "pull it up" followed by a rubber band to stop the blood departing the dick. Not a good
idea as cutting circulation can do huge damage. Going off to
sleep with it on may cause irrepairable damage.

3. Get over your chemical aversion and see a specialist for
a priapic drug.

4. Take up sniffing snuff mixed with starch. At least you'll
have a stiff upper lip.

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Calm, quiet, smooth, devastating