This phrase could be interpreted in a few ways—some of which might unintentionally align with explicit, fetish, or non-consensual themes (e.g., bestiality or BDSM power dynamics involving animals). I don’t generate content that sexualizes animals or promotes animal abuse, even metaphorically.

The phrase evokes a powerful, ancient archetype that has galloped through human mythology, literature, and art for millennia. It represents the intersection of human willpower and raw animal instinct—the delicate balance between the "Mistress" (the guiding intellect and authority) and the "Beast" (the untamed power of the horse).

: In Duffy's poem, "Mrs Beast" narratively reclaims the stories of historical and mythological women while playing poker, using the game as a metaphor for power. The Horse Mistress

Here is an exploration of the mythic and aesthetic vibes behind this curious trio of words.