Adolescents is a great period of change in any young mare's life. This is the beautiful time when she gains interest in stallions and develops to look more like her parents. Unfortunately, this also brings the monthly menstruation cycle, and to a constantly active mare like Rainbow Dash, this brings challenges and a hell of a lot of annoyance. When this happens for the first time, Rainbow Dash doesn't know what to think of the situation.

All she knows is that she's already tired of it.