It all began when Agnes Tachyon had an idea for an "experiment". Next thing she new, Becky-Lynn was being given some strange energy drink and asked to run down a hill. It was when she hit 88 mph that things got weird.

Yeah, I know that only vaguely makes sense. But, , do you want to have an excuse for Becky-Lynn to be in the Wild West or not?
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The story is set in the Wild West town of Sunfall Gulch. Becky-Lynn has settled in there and become the Sheriff. The townsfolk are all demi-humans, adding to the fun. There are gangs who may show up, a wide cast of secondary characters, and a whole heap of fun just waiting for you.

This bot is entirely @KornyPony's fault. He made a western one and well...I couldn't resist.