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A few years ago I was living with a roommate who was also an old friend. When my girlfriend had to move out her apartment, I told she could stay with us for a few weeks until she found something else. She was a few years younger than my friend and I, she was South Asian, with dark brown skin, beautiful DD breasts, a slim waist and a well proportioned body. Lucky for me, she loved being naked, and always slept naked. As far as I knew, though, she was not an exhibitionist.
One morning we wake up, she is naked in bed as always. For some reason, the first thing she says is "there's some mail that I forgot to give your roommate yesterday when I checked the mailbox and I still have it. I better give it to him". So she gets up, wraps a towel around her body (she didn't even tie it around herself - she was holding it with one hand), picks up the envelope, and walks over to my roommates room. Next thing, I hear them both laughing and she comes back to the room with a smile. I ask her what happened, but she doesn't say much. I can guess though.
The following weekend, something similar happens. She wakes up naked, puts on a pretty short t-shirt that ends right below her ass, and nothing else, no panties. She says "I have to make a call", and goes to the living room where the phone is (she didn't want to use her cell phone, inexplicably), and where my roommate is sleeping on the couch, as he often would when watching tv late at night. Again I hear them start giggling. Again she comes back, I ask her what happened, and she says very little. I can guess though.