She tells the truth

Under the intense glare of Weiss ruby decides to tell Weiss the truth.

“I’m naked because it’s exhilarating Weiss, the feeling of wind against my breasts, the thrill of almost being caught and the serenity and freedom of wearing nothing at all. All these feelings come together to make any risk worth this feeling of ecstasy.” Her face may have been as red as the cloak she’s known for but during, her speech she got more and more confident showing more of her Shapley curves until she was standing hands on hips confidently telling the world her perverted night time adventures.

At the end of her declaration she silently waits for Weiss’ response, who either looks visibly shocked or disgusted by her remarks

“so now you know Weiss, the part of me even yang doesn’t know, I know you're mad and are going to report me to Ozpin but could you try it once? you don't have to be completely naked, maybe just your shirt? I want you to feel what’s it like to let go and have the pleasures of being naked.”

“What!?” the question seemed to have woken her up from her stupor. Weiss is shocked that ruby could even ask such an absurd question. Her mind racing, remembering the repercussions of being outside in a bikini for a beach day let alone completely naked, if she were caught by her father her life would be over.