Reaching back behind himself, he grasped gingerly at the beads. At his touch, they thrummed and shifted, even seeming to change size and shape. They were slick with some kind of lubrication which had spread outward from his rear, and he felt the cool liquid against his fingers as well. A sharp smell hit his nose, and he couldn't help but bring his hands forward in curiosity.
His hands seemed to be coated in a viscous black substance. Even as he watched, it smoothed out, forming perfectly around his hands like a pair of rubbery gloves. The fingers with thick, and his middle and ring finger on each hand seemed to stick together, being covered in a single sleeve each. On the bottoms of his hands he found raised lumps. Belatedly, he realized the gloves resembled paws with pudgy fingers.
He looked below him in time to see his cock being swallowed up by the same substance, his entire waist coated in what looked like a pair of dull black rubbery briefs.
Adrian had no time to really ponder this, as he heard the ominous 'sszzp' of the string coming untied from the toolbox lid. All at once, there was a bead pressing eagerly at his rear, seemingly pulled inward by the bead or beads still inside him. The slick rubber coated his waist must have made its job easier, as he felt it push inward, followed by the next.
He could only arch his back and mewl in a begging tone as one by one the beads pulled inward, each faster and more insistent than the last. Finally, the last item on the line pushed at his entrance, and his mouth gaped open in desperation as the much larger plug seemed to push and squirm its way inside him. Along its increased length he could feel little nubs, each acting to drive him further into the throws of pleasure.
When at last it seated itself, his sphincter clenching shut around the narrow base, Adrian lay trembling and mewling on the carpet, unable to even move again as the line of tortuous pleasure in his gut danced and writhed within him.