A commission from  jerberjer featuring the Vixens (owned by  Berserker88X) mastering Hitsume Ashiatsu and registering their mastery in an ancient scroll. The scene is from this fanfiction down below.
https://www.furaffinity.net/view/46107408/
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As assassins, the Vixens were tasked with many educations to learn the trade. They learned martial arts, seduction, espionage, and more. As an elective, they chose to be professional masseuses to take off their targets. One of the courses involved ashiatsu, the art of massaging with feet.
The Vixens were put under the tutelage of Minjie De Niao, a crane who is a master of Hitsume Ashiatsu. Under her tutelage, the Vixens turned their paws into deadly weapons capable of internally damaging their victims by kneading them.
As a celebration, Minjie had the Vixens place their paw prints on a Hitsume Ashiatsu scroll, earning the rank of masters and joining the very few who mastered the style under her tutelage.
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Characters belong to  Berserker88X
Art by  jerberjer