In the dimly lit dungeon, the mistress, clad in black latex, towers over her bisexual sub, a strapon harness accentuating her powerful physique. She strokes his hard cock, relishing his conflicting desires. "You want this, don't you, my slut?" she hissed, pressing the lubed strapon against his tight ass. He whimpers in assent, pushing back as she slips it in, inch by inch. She fucks him relentlessly, her pace quickening, their groans filling the room. She smirks, knowing he's close, and slows down, drawing out his torment, ready to push him further into his taboo pleasures.