I think you're over thinking it Medo.  Ariel sat in the middle of the couch next to Marc.  Derrik sat next to Ariel and Mike sat next to Derrik.  I figure Ariel's a small girl.  We've all seen people squeeze onto a couch before.  People are going to move around, etc.  It isn't a stationary game.<br/><br/>Further, why limit the scene to a picture?  It's a text based environment... a slightly larger couch with the same color floor and fireplace works just as well as what was in the image.  Just go with what's been written, if it doesn't match the picture, adapt the picture in your mind to fit the story.