Samantha returned to the locker with the trunks she got at the shop. As she wanted to change back as quickly as possible she just grab a pair of trunks, paid and rushed away. She did not notice that these trunks were designed for girls of about 12 years.
When Samatha got out of her bikini she stepped immediately into the trunks. They seemed to be a little tight in the first moment but fitted comfortably soon.
She stood in front of the mirror and waited for the changes to begin. And indeed, her breats started to shrink but stopped somewhere on the way leaving her with breasts of a girl at the beginning of puberty. She also lodst about one foot in height and her curvy body became a little more straight. But her hair and face did not change much.
After the changes had stopped Samatha saw that she had become a girl of 11 or 12 years.
She quickly stepped out of the trunks and only then noticed what she had bought.
She started seraching for the receipt as she wanted to exchange theses trunks. While seraching she found a top going with the trunks that she failed to notice earlier.