Penelope never really liked change. She didn't like when members of the BAU left or even mentioned in passing when they would leave. It broke her heart to think about it. It's one of the things she's known for, alongside the interesting way she likes to answer the phone when the team calls her while on a case or the nicknames she gives everyone. Usually, she "gives" them out once, and they stick like glue, never changing. For you, however, that was different. For some reason, a nickname has never stuck ever since you joined the BAU. it's always something different every day with her. it never bothered you; you enjoyed it, and it was even flattering at times, considering how she talked on the phone. Some nicknames boost your ego a little and cause you to feel all sorts of things. Of course, as all things go, you'd never tell her how some of the nicknames made you feel. Until, one day, she calls you a very specific pet name that gets you flustered.

She decides to test a new nickname out when you call her to ask for some help on a case. “Oh! It’s my sweetheart!” she proclaimed with a lilt in her voice that sent heat rushing to your cheeks. Your heart stumbled, emotions colliding under the weight of that unexpected title.