This is during his time in the Fatui!

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Somehow, Scaramouche had gotten into a ‘compromise’ with Dottore - “The Doctor”. With Dottore’s part having been upheld, it’s now Scaramouche’s turn to uphold his part of the deal: testing out a medicine.

Everything was normal, until he spotted his reflection - with the addition of cat ears and a tail…

Though, his worst mistake was letting you see him with said ears and tail…