"Hello, pet."
Before you have a chance to react, a hind hoof knocks you to the floor. You fall flat on your back, the phone you were using to try and escape landing right next to you. Behind the mare, so agonizingly close, is the fresh air and bright sun of the outside world. It's only been a few hours, judging by the setting sun, but it feels like days since you've been trapped here. The horse steps back as you fall down, and her giant booty blocks out the sun, making you wonder if you'll ever be have the chance to see it again.
You turn to your phone just in time to see a mighty hoof slam down on it, shattering it into pieces.
"Oops~." She says, letting out a satisfied whinny. "Don't worry. You won't need it any that little toy anymore. Not where we're going."
You try to shake your head, to whimper, to beg for mercy, but nothing comes out. You already know that there's one thing she wants from you. You can only stare in awe as the mare sways her rump back and forth in front of you, taunting you with what's about to happen.
Agonizingly slowly, the succubus lowers herself, her fat butt gently but firmly lowering down onto your face, gently but firmly crushing you under her immense weight.
She lets out a relaxed sigh, the feeling of superiority and dominance sending waves of pleasure through her body. You can smell her arousal, and the scent of pure mare lust makes you shudder. She'd have to tell the others about this. Such humiliation has never been so delicious~.
As she pushes down harder, you feel your face become wedged between her two giant cheeks. It's nearly impossible to braethe under there, and ever breath is laced in horse pheromones. Outside, you can feel her hoof playing with your cock, prodding at it from outside your pants, her long, wet tongue sliding along the fabric. If it weren't for your clothes, you'd probably be moaning right now...
You claw and pound at her jiggling fat ass, your hands sinking in to her cheeks as you try in vain to prey it free. There won't be any escaping this time. The succubus is going to make sure of that. She intends to smother all of the energy out of you this time, and there's nothing you can do about it.
But that doesn't mean she won't prolong your suffering. Every few seconds, she'll lift her rump, giving you a precious gasp of air before slamming it right back down on top of you.
Your grip on her butt becomes weaker as time goes on. Pounding turns into desperate grasping, until eventually your arms lose their strength slump to the side. Your new mistress celebrates by jiggling her ass up and down over your head, letting you marinate in your defeat as she drags your face back and forth along the cold stone floor.
Eventually, she decides it's time to finish you off. She sits down one final time, putting her full heft on top of you. You can barely breathe anymore. You can feel your consciousness slipping away, your face buried under tons of pure equine fat and muscle. The only thing you hear from between her two all-encompassing cheeks are the sound of vicious, sadistic, and victorious laughter.