What a lovely installment, stuffed with gems: I loved the bit about Harry's presence brightening the room, and Severus referring to the couch as theirs and to Harry as his couch-partner, LOL. I always have my guilty pleasure seeing Severus jealous and it fills my heart with joy that he didn't flee in the end but opened the proverbial door a bit for Harry, even if he was frightened out of his knickers.
Also, I have my suspicions about Harry making Severus jealous deliberately. (in this case 10 points to Gryffindor)