> Sumisa-chan.... What a cute blacksmith she is.... Very talented....

If you notice, MC just called her Sumisa-chan, instead of -san, why? it might be she looks a lot of Loli.
If ever Sumisa was a proper lady, MC will call her still -chan, instead of -san, she was just that cute...
> When MC mentioned the Coke to Fuel-merchant-san, what im thinking instead is cocaine, not a fuel...