The air crackles with anticipation as the submissive, blindfolded and collared, awaits his Mistress's touch. She approaches, her heels clicking on the hardwood floor, a TENS unit in her hand. She applies the pads to his chest, his thighs, his erect cock, and flicks on the power. His body jerks as the current surges through him, his breath coming in ragged gasps. She leans in, her voice a low purr, "You like that, don't you, pet? You like the bite, the sting, the way it makes your cock throb." She rewards his moan of agreement with a stronger pulse, making him cry out, his body arching towards the pain, seeking more.