You lift the hyena mask over your face & put it on. Looking in the mirror you are amazed how good it looks, the fur looks realistic, the teeth seem sharp, you could swear that this was a real hyena head. In hindsight though, looking in the mirror, it is pretty funny how the hyena head looks on a normal persons body. You chuckle to yourself. You keep looking and the more you do you keep laughing harder and harder. Evauntually you can't breathe, but you keep laughing and laughing. Your vision fades as you collapse on to the ground.
You wake up and notice there is no longer light pouring into the basement, it must be late. You reach into your pocket to pull out your phone. As you go to check you see a clawed had covered in fur. You run over to the mirror and look. The mask had fused with you body. You take off your shirt and pants to see your new body. As you do you noticed your shoes are nearly destroyed from the large new feet. Your body is covered in the fur and you seem taller. While you can stand up right your legs are noticable more canine.You look like a cross between a werewolf and a hyena. You remove your underwear to find out your manhood has grown massivley. You try to pull at your face to see if this is permanent, but nothing budges. You are now an humanoid hyena.