Adrien was so out of it that he didn't notice that the rubber was continuing to engulf him until it had swallowed half his torsos. By then it was too late to do anything about it. He squirmed feebly on the carpet, trying futilely to rub the black liquid substance off his body, but all he did was spread it around. Where it settled against him, it stiffened to a thin but strong slick surface.
He'd called it rubber but it was more like skin, only soft as velvet and slick as latex. And as he discovered when reaching his paws for the scissors, impenetrable as steel.
It was running down his arms and legs now. Covering up his feet and joining with his paws. All that was left was his head. The substance moved slowly on this last part, as if savoring Adrien's helplessness. It crept slowly up his neck with a tickling sensation, then reached across his head and surrounding his face.
Now it slid over the last free part of his body. It covered his eyes and flowed over his nose, forcing him to open his mouth in order to breath. Like a lover's kiss, it rolled across his lips and invaded his mouth. Adrien could feel it invading his insides once more; only this time, it was his throat that was being violated. It felt like a cock sliding deep down into his throat. Forcing it's way in. Making Adrien gag. He felt it burst, like an orgasm, filling his belly like cum. He didn't know what it was doing to his insides, but he felt it changing him in ways he could not understand. Rearranging his very insides to fit the use it had decided for him. All he could do was squirm, blind and helpless while irreversible and permanent changes took effect.