You cower in the corner, unsure of how to combat this threat. The costume that had been laying harmlessly on your bed has now taken on a sinister life of its own. Only the head and groin have any shape to them, while the rest of the equine suit hangs down and trails on the floor. The horrible, vacant eye holes look down at you from the horse head.
The flying suit lowers until its snout is mere inches from your face. You keep staring at the thing, frozen by fear. The costume then retreats a little from you. You stand back up, ready to make a run for the door. The horse suit begins to slowly rotate until its back is to you. You run for the door but the latex horror blocks your path. To your shock, you can see that the suit is no longer smooth rubber, but actually appears to be covered in fur!
You can't think of any way out of this situation, short of jumping out the window. That small moment of indecision is all the suit needs though. Without warning, the seams along the back of the suit open of their own accord and the entire costume rushes at you. The slack arms of the costume wrap around your own while the equine legs and feet attempt to cover your own. The torso of the horse-man still hovers in front of you, but you can still turn to look at the back of your legs as they are sealed into the legs of the suit.
The costume jerks you around the room as you try to fight it off. You can feel your own legs being coated by the suit. Most disturbing of all is that you don't feel latex coating you, but what feels like a second skin. The suit slides up the back of your legs until it reaches your butt. Being the costume was anatomically accurate and nude, a horse-man's posterior now covers your own. Still, you resist the suit's attempt to cover you, the horse tail now swinging about.
But while you were concerned with the backside, the suit was also covering up the front. The erect horse cock overlays your own groin and you begin to feel everything through it now. The rush of pleasure from the equine organ swinging about distracts you from the task at hand. You stop resisting for a moment and the costume moves up your torso.
"I can't let this thing win!" you say to yourself, regaining control. You resume trying to pull the suit off, but the arms of the costume are beginning to draw your own arms in. Even as they overlay your arms, the suit still exerts a measure of control over your limbs. Whatever will motivates the costume knows how to distract you again. The horse-man arms, your arms, now move down to the still erect rod protruding from your loins and begin to stroke it. The sensation feels so good that you forget resisting and let the pleasure take you. The horse head finally covers your own, the mouth now lined with equine teeth and eyes, your eyes, finally fill the sockets. But none of this concerns you. The arms have stopped moving on their own and you yourself now stroke your horse cock. You pass out as the world explodes in ecstasy.