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Has your motorcycle been down on its side at all lately, as in all the way in the ground like you dropped your bike?
That drain hose drains from the area around the gas cap. In case you spill any fuel there when refueling, the plastic collar (for lack of a better term) channels it to a drain hose, which is that hose.
Maybe your drain bolt wasn't quite tightened, or the crush washer has been re-used and over-crushed? Check the oil filter, too, to see whether the gasket on that isn't quite sealing. That can happen if the filter isn't snugged up properly, or sometimes the old gasket will stick to the base plate and you'll put the new filter on without noticing, resulting in there being 2 gaskets there. That'll often leak, sometimes suddenly and catastrophically.
Might just be a slightly loose bolt somewhere. There are other plugs and such with o-rings that _may_ be leaking if the o-rings aren't seated properly or something.