Eventually it'll wear out and fall off on its own. In the meantime underwear can be washed in-place.
Is the beast Cthulu?
what if your not wearing underwear?
Cthulhu isn't _covered_ with tentacles so I wouldn't think so. Probably just some big generic monstrosity.
Never Nude?
Where should this comment appear?
This pairing only
Whenever "Never take off the underwear that you are currently wearing ..." appears
Whenever "Be a gigantic beast covered with tentacles" appears