The Oak Lawn teens talk in excited bursts of language that well up like sudden summer storms, typical of 15-year-olds. When you see one, there is a 99-percent chance that you will find the other. Pals since preschool, Sarah and Bridget frequented the same birthday parties and school activities at St. Linus School. “We just said hi,” Sarah recalled of their first meeting as 3-year-olds. “I remember playing with the little train set,” Bridget said, both girls laughing so hard they can barely get...