The delivery guy passes out on the floor. You guess the stress of his change exhausted him. You don't really care about him, though. The oral sex brought something out of you, something caused by your own transformation into a horned man-beast. You realize your new purpose, to spread the joy of beardom to any man you encounter. Spurred on by this thought, you turn your back on your first victim and head to the door. It's a big world and you have a lot of work to do.
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(Since "you" have left, the narrative will now switch to third person to cover the delivery guy's story)
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Hours passed, and mid-morning turned to late afternoon. Darrel eventually began to stir. "What happened? Where am I?" he asked himself as he rose to a sitting position. Darrel looked around the strange room he found himself in. "Why does my mouth taste so weird? It tastes like... cum?!" That thought brought everything back to his mind.
He remembered what happened that morning. He was doing his job, working for Brown Van Parcel Service, when he had a delivery to this house. The recipient was a huge man, bearded and gruff looking, wearing ill-fitting sweatpants. The "bear" made a pass at him, and Darrel, to his shock, reciprocated. He didn't know why, but that man had a a charm to him.
Darrel was straight, but he thought about that man for the following few hours. He even had the urge to return to this house. He gave into it, entered the house and found the resident had changed into a horned, tusked beast. Darrel had to suck his dick, and he did. He must have passed out afterward.
"I have to get out of here," he said to himself. He would have a lot of explaining to do to his boss, about why he was absent half the day. Darrel passed by the hall mirror and froze. His body had changed! He was naked, but that wasn't important. He was fat yet muscular. He was also covered in thick body hair and was hung like a stud. He looked similar to the bear who lived in the house. A realization hit him, "That bear must have been changed too. But how?"
Darrel needed to leave, to find answers. But he couldn't leave the house nude. He walked to the foyer and discovered the box of Arctos gear he had delivered. A glance inside confirmed that it was clothing sized for a man of his new proportions.
Darrel also saw a large box on the porch, another package with the Arctos logo. He opened the door and checked to see if anyone was around. The surrounding area was deserted, so he brought the parcel inside. He opened it to find what the previous resident ordered. Darrel was overcome with the desire to wear the clothes. It wasn't just a need to be clothed, but a strange urge to wear clothes that would fit the bear archetype.
The first box had a pair of jeans, flannel shirts, suspenders, and a leather belt. The second package had several leather jockstraps, along with wifebeaters and black leather boots. Not knowing why, Darrel pulled on one of the leather jocks, its pouch holding his new, larger manhood. A wifebeater covered his hairy torso. On went the jeans and a flannel shirt. The pants were secured with the leather belt, and the leather boots held his feet.
Darrel checked his appearance in the mirror before he left. He was dismayed to see how bearish he now looked. But he was also slightly aroused, to his surprise. "I have to get out of here."