Cupcake

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Girl goes to guys birthday party( grew up with boy but boy moved away) with other girls from different school, girls are jealous that guy likes the girl even though the girl doesn't know it. Girl gets cupcakes smashed in her hair and boys mother sends girls home, girl washes hair with help of boys younger sibling, boy goes in bathroom while girl is taking shower (it is a swim party, girl has suit on...) younger sibling is in there helping already, boy gets in with girl and helps wash her hair out, there is a family disaster and girl has to stay somewhere. Boys mother offers for her to stay at their house, girls mom agrees with some argument so girl stays with boy and their relationship