"Okay," Ben said, "I have always wanted a rocking chair in my room and you're giving me the opportunity to customize it."
"That doesn't sound very sexual."
"Ah, but that is where the customization comes in. I can turn you into a rocking sex chair. Trust me. You'll be well used."
Matt let Ben start typing on the computer. Matt tried to look over Ben's shoulder to see what he was typing but the transformation started while Ben continued typing.
"You better get undressed while you still can."
Matt quickly got naked which became difficult as his body stiffened up. He noticed that his skin was turning into a different material. He didn't recognize the material. It seemed to be a blend of canvas, fiberglass and latex: firm but soft.
Then his body parts started to rearrange. His head sunk down into his chest. His legs split into four legs. His privates rotated clockwise. But before the transformation finished, he disappeared and reappeared in Matt's room.
When the transformation was finished, Matt didn't know what he was transformed into. All he could see was Ben's ceiling. He found he could rock back and forth but no matter how far he rocked, he still could only see Ben's ceiling.
He tried moving his arms and legs and found he had some movement but it was very limited. He could not move across the floor and he could not reach out and grab anything.
He tried calling for Ben and found that he could speak but only softly. He couldn't yell. He doubted anyone could hear him if there was anyone else in the house. He wondered what Ben's family might think if they discovered Ben's new rocking chair. But for nearly an hour, nothing happened and Matt just had to sit their waiting. He began to regret his decision and wished to return to normal.
Finally Ben came home. He looked at his new rocking chair. It looked unusual but no one would immediately notice that it was a former person. It was skin tone. The arm rests were shaped like human arms and the legs were shaped like human legs. The back and seat were ergonomically designed and there were some weird switches on the seat but as long as Matt stayed silent and still, people would just assume it was a weird rocking chair, not a person.
"Ben, I've changed my mind. Change me back."
"Silence. You wanted to be used and you're going to be used."
Matt protested but Ben was already stripping off his clothes. Ben then flipped a switch on the rocking chair's seat that caused the dildo attachment to pop out. Another switch just under Matt's hand caused Matt's balls to pop out which Ben squeezed.
"I've never tried anal before so you get the honor of being the first inside me."
Ben sat down and Matt saw Ben's naked butt as it descended onto his face. There were also two holes on the seat and Ben put his cock inside one hole which was Matt's mouth, and then inside the other hole which was Ben's ass.
Ben rocked back and forth continuing to use Matt as a sex toy.