The beanbag, so far, had been contentedly sitting there undisturbed. If Taran was paying close attention when he nudged it with his foot, he might have noticed a slight wobble - but, then again, that was generally what beanbags did when you nudged them.

When it was jumped on, however, the beanbag reacted in a decidedly non-beanbaglike manner. There was a ‘whuff’ sort of sound that wasn’t quite air being expelled, and then it started to move. Quite decisively.
From the base of the beanbag emerged four stubby legs, and it rose, leaving Asuka to bounce off and back onto the ground.

Now it had shaken off whatever it was that disturbed its rest, the… beanbag…? creature? blinked around with its beady eyes. It peered down at Asuka and then up at the other two around it, and although it didn’t have much in the way of a head, you could swear it was shaking it. It then made another whuffling noise and crouched back down to nudge Asuka. Perhaps it was admonishing, or maybe apologising… Either way, for such a large beast, it didn’t seem immediately harmful.