Today is your first day at the gym. You are not used to physical exertion, so you are very tired. After training, you walk into the locker room and see a huge anthropomorphic horse standing in the middle of it, its powerful back covered in sweat, drops running down its muscular arms. He turns to you and you see a huge bulge on his boxers. "Oh, hello. Are you new here?" he asks, "I didn't think such... nice people came here," he says in a languid voice, lowering his eyebrows.

"I'm Mark," he says with a friendly grin, taking a step closer to you. "You look... tiring." His voice is smooth and deep. "Would you like me to help you unwind?" He nods toward his throbbing penis. "There are other ways..." He lowers his head, revealing the bulge on his boxers even more prominently.

"No need to be shy," he says softly, reaching out to gently caress your cheek with the back of his knuckles. "I'm here for you... and I bet you could use some relaxation." His penis twitches beneath its confines, leaking more pre-ejaculate onto his boxers. He steps even closer now, close enough to feel the heat emanating from his huge body. "Just let me help you..."

His voice is hypnotic, commanding. You can't help but feel drawn in by him.

With a deep, contented sigh, Mark wraps his strong arms around you and pulls you close, pressing your body against his massive frame. His hot breath fans over your neck as he nuzzles it gently with his nose. "That's it," he murmurs, "let go... surrender to me..."

His hands move down to your ass, feeling the firm muscles through your sweaty clothes, kneading and massaging them. "You feel so good," he whispers in your ear before planting a soft kiss there. His tongue darts out, licking the sensitive skin behind your earlobe.

As he continues to stroke you and explore your body with his lips and breath, the tension begins to flow out of you, replaced by a growing sense of relaxation and desire. Your head spins as Mark's overwhelming dominance washes over you. "You are mine now," he growls, "and I will make sure you feel every inch of my giant cock..."

With a contented grunt, Mark pulls your body even closer to his massive erection. His thick penis slides over the crotch of your sweatpants, the hard ridge teasing and massaging your sensitive folds. With one powerful thrust, he pushes forward, forcing your panties aside and revealing your dripping sex. "Oh fuck," he groans as he feels how wet you are for him. He begins to stroke you faster and harder, his cock leaking more pre-ejaculate onto your crotch with each thrust.

His free hand gropes at your breast, fondling the soft mound through your sports bra before cupping it entirely and massaging your nipple. "You want this big cock inside you?" he growls into your ear, his voice hoarse with desire. "Tell me."

The weight and size of his manhood are intimidating, but somehow it feels perfect pressed against your opening. He pushes forward again, sliding deeper into your hot, wet core. "Yes," he pants heavily as he begins to pick up the pace, "take all of it..." His hands move back to your hips, holding you steady as he thrusts powerfully in and out, driving his massive cock deep within you over and over again.

The sensation is unlike anything you've ever felt before; Mark's sheer size stretching and filling you in a way that borders on painful, but in the best possible way. With each thrust he makes, your body trembles with pleasure as his veiny length slaps against the inner walls of your sex. He growls deep in his chest as he feels your inner muscles begin to squeeze and milk him, intensifying the sensations coursing through him. "Fuck," he groans, "I'm going to cum..." His pace quickens further as his massive erection pulsing and twitching within you.

"Yes..." he grunts, "Cum with me..." His thrusts become even deeper and faster now, his enormous length slamming against your G-spot over and over again as you both approach orgasm. With one final powerful thrust, Mark cums hard, filling you up with his hot seed as his entire body shudders with release. His massive penis spasms inside you, pumping wave after wave of thick cum deep into your womb.

He holds you close as his orgasm subsides, nuzzling your neck and kissing your ear. "That's it," he whispers hoarsely, finally slowing his thrusts. "Just relax now..." Your body feels limp in his arms as the wave of pleasure washes over you. You're sore but satisfied, content to let him hold you until your heartbeat returns to normal and your breath comes easier once more.