She was disguising herself as a man, but he didn't notice her, but accidentally touched her body. In order to relieve the embarrassment, he pretended that he was also disguising himself as a man.
She was dubious, but he was naturally evil and his face was prettier than some girls, so she thought what he said was true, but unexpectedly she was dragged to the women's bathroom together.
Hence the awkwardness of their first meeting. . .