Answer:
Imagination!! Is that really all your materials?? No sheets?? No cardboard?? Laundry baskets?? Hope this suggestion makes sense: perhaps you need permission first? Tip it forward so the seat is parallel with the wall and the back is now parallel with the floor. So the seat-part of the couch is now a "wall", and the back-part of the couch is now a "celing". Use the cushions to make another "wall" by standing them up on end and lean against your new "celing"