Yup, that's the one! It was one of my favorite TF events from exile.
"Awooo! - a shivering, involuntarily shaved tundrawolf woman needs warmth to survive! Offer her the warmth of your body for a night. Warning, her saliva can be transformative... Teaches a recipe that allows party members to transform into anthro tundrawolves.
This will be going up as a prompt in the Patreon polls tonight.