Yang, intrigued by Lana's alluring RWBY cosplay, watches from the shadows as Lana, dressed as Ruby, indulges in a private moment. Lana, oblivious to Yang's presence, stands before the mirror, her reflection a tantalizing sight in the form-fitting costume. She begins to touch herself, running her hands over her curves, her breath hitching as she imagines Ruby's adventures. Yang, hidden, feels a thrill, her heart pounding as she watches Lana's fingers dip into her panties, her hips grinding against her own hand.