How to create a comfortable place to sit that doesn't take up much space?

There’s not much space in my room (12 m2), so I don’t really have room to place a couch (it would theoretically be possible, I suppose, but wouldn’t leave a lot of walking room, so only as a last resort). As a consequence, when I want to want a movie with someone, there’s not really a great place to sit – it’s mostly struggling about with my desk chair and sitting, quite uncomfortably, on my bed.

So, does anybody know of a way to conserve space while creating a good place to sit? Is there e.g. something I could place on my bed while e.g. watching a movie (it’s 1.4m wide) but then remove it afterwards? Or do there exist couches you can quickly set up and remove again quickly? Are there other solutions, preferably not too expensive?