Kelly, with a mischievous grin, secures a strap-on dildo around her waist, ready to give Mark a bisexual awakening. Mark, nervous but excited, lies on his back, his cock already hard. Kelly traces his asshole with the dildo's tip, making Mark squirm. She pushes in, and Mark gasps, feeling the dildo stretch his ass. Kelly fucks him slow and steady, enjoying Mark's moans and the sight of his cock leaking pre-cum. Mark, not ashamed of his pleasure, strokes himself, loving the taboo feeling of being fucked by a strap-on. Their bodies glisten with sweat, the room filled with the sound of flesh slapping against flesh and Mark's moans. Kelly's thrusts grow faster, harder, until Mark can't hold back, cumming all over himself, his ass still filled with the dildo.