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"Serpent's Gate" by Christina Nordlander

Threshold is a room. "Wilderness."

Serpentgate is a locked door. "North lies the dungeon gate, shaped like a serpent's head. [if Serpentgate is closed]The jaws are shut." Serpentgate is north of Threshold. Description of Serpentgate is "The serpent nostrils are widened. The jaws are shut." Understand "gate" as Serpentgate

The nostrils are part of Serpentgate

After touching nostrils:
say "They twitch. The stone jaws grind apart.[paragraph break]You take a step into the gloom.";
end the story saying "You have won"

Understand "tickle [something]" as touching