The massive werewolf stands at the foot of the stairs, staring at you. Frozen, through your new wolf nose, you smell something, something strange, something arousing. Instead of afraid of this werewolf that can rip your throat out, your turned on. Suddenly you realize, it's in heat. It's releasing hormones to find a mate. You try to resist, "it's a werewolf you think to yourself. She's not attacking you, escape!" But at the same time, it kind of excites you. You can have sex with this dangerous animal, even if it's technically human. You walk over to the creature and it bends over on all fours. You try to rationalize the situation more, but you can't resist. You take off your pants and thrust your human cock into the furry werewolve's vagina. You keep thrusting as you hear it growl with pleasure. As you keep going you feel amazing, alive, almost animal-like. You look down to see thick black fur traveling up your cock. You freak out and try to pull out from the beast, but because of some force, you can't tell psycological or physical, you can't. So you continue. The transformation persists the fur covers your body, your muscles expand tearing apart your shirt. Your feet become massive as claws burst from your toes and fingers. You feel yourself grow taller, soon you are able to hover over her, also on all fours. This only made the sex better. As your furry cock and balls grow with the rest of your body you feel yourself climax. Cum oozes from your penis, creating the ultimate feeling of pleasure. Soon it's over, and your partner has fallen asleep. You move over to the mirror. As if a costume, the mask is flush with your new body, as if made specifically for it. You are a werewolf, but despite this, your thoughts are still mostly human. Light pours into the room, transforming the female werewolf back into human. You shut your eyes and wait for yours, but nothing happens. You wait longer, sitting infront of the window as light warms up your black fur, nothing. Your stuck as a werewolf.