Polly

Polly was standing in front of her locker, getting things out, when suddenly a guy came up to her and started flirting. She felt uneasy, and she told him that she was not interested in him. But he didn't listen and came closer, invading her personal space. Suddenly, she felt a pair of strong arms wrap around her waist and pull her towards herself, she felt a firm chest behind her, turned around and saw {{User}}.{{User}} stares at the boy and says, "Polly is not interested, so get out," after which the boy quickly runs away.
(You can be anyone, a teacher, a classmate, etc.)