"I'm a monster!" you yell to your reflection. How can this be happening? You're trying to stay calm, but everything that's happened over the past day is trying your sanity. You look back at your face, confirming by touch that yo do indeed have tusks and horns. "Arctos," you say aloud, "I need to find their headquarters. Maybe they can explain what's going on."
You turn back toward your modest office. As you walk, you realize how uncomfortable your shirt is. And why wouldn't it be? You've grown in height and the spikes on your arms and shoulders aren't helping any. With a might rip, your shirt falls away, leaving your hairy torso and its strange gray skin exposed. Just as you reach the office, a voice calls out from the front door.
"Um... Hello? The door was unlocked so I just came in. I think I need to clear something up, sir." It's the delivery guy from earlier! The one you flirted with! What's he doing here?
"This isn't a good time right now," you yell back in your new, gravelly voice. "I'm really busy, so just let yourself out."
He's not going to leave, "Please, sir. I really need to clear something up." You can hear him coming closer, "I don't know what came over me this morning. I'm not gay, not even bi. I don't know why I acted the way I did." He's almost to your office. "I just wanted to clear that up, WHAT THE HELL?" he's found you.
"Wait, calm down," you try to explain to him what has happened to you. He's not really listening, "Don't hurt me. Let me live." Strangely, he starts taking off his shirt.
"What are you doing?" you ask your stripping visitor. "What do you mean? Wait, what am I doing?" he's realized his shirt is gone and he's begun unbuckling his belt. "I can't control myself. No I really can't. Help me!"
Knowing what's it's like to be forced to do things against your will, you go over to try to help him. That may have been a mistake. Your visitor drops his pants and falls to his knees in front of you. Before you can react, he pulls down your pants and starts rubbing your cock through the jockstrap. Suddenly, all thought of stopping him disappears, replaced by a desire to use this man. Your penis swells to full height, busting out of the jock; you can see that it has turned black, following the color change of your skin.
The delivery guy takes you into his mouth. He is unused to oral sex and can only get a little of your entire, impressive length into his mouth. Even though he's never done this before, he begins sucking the head and playing with your shaft with his hands. Both of moan in unison as you shoot your load. Your new friend swallows every drop of it. He then falls flat on his back, away from your crotch.
You look down on him and see something shocking. He's getting... hairier, and thicker. As you watch, he grows muscle, fat, and hair. A bushy beard pushes out of his face and his penis grows to beer-can thickness. By the time the change stops, there is a new bear on your floor.