Boy the writers really think they can convinces the world that Penny thinks of Sheldon as a son? We are not likely to get much shenny action with this type of attitude.
There's so much more potential, they must be so blind. These two jump off the screen and leave the other combos for dust.
http://au.ibtimes.com/articles/500370/20130821/big-bang-theory-season-7-spoilers-sheldon.htm#.UhYXr2TTV-M