In a private dungeon, a bound slave's most intimate place is explored by his Mistress's demanding finger. She pushes her digit into his urethra, feeling the tight, pulsating walls, as the slave gasps and moans, his cock throbbing with a mix of pain and pleasure. The Mistress continues her relentless teasing, making him leak copious amounts of pre-cum before denying him his release, blocking his cumshot.