I was just thinking the other day that crushes would be a fun and realistic 'chance' card for teens - they could follow up on it or not, depending on whether the player wants to encourage it. You could have mood swings connected to the crush - flirty for a new crush, sad if it's not working out, mortified if the crush isn't interested.
A teen pack might be in the offing, come to think of it - family players got laundry, adult Sims got Jungle Adventures, kids got My First Pet. Teens have been mostly the red-headed step child in S4. It would appeal to actual teen players, as well as to adults who like to play families.