[delay]

It's odd how something which was almost unthinkable, once it happens or is happening, becomes almost normal. Then you think back on it, and it's like, "Wow, that happened??!!"
The rest of this story:
When she walked into the room naked, covering her breasts, all three of us laughed, especially her. Her laugh I think showed her excitement at being able to explore this situation. And I think she was also playing up the part of being embarassed. But it wasn't like she was being walked in on while she happened to be naked, she was knowingly walking in on us while she was naked (at my request)!
I motioned for her to come and sit in my lap, and she did. The whole time, my roommate, other than laughing a little, was playing it pretty cool. I guess he wasn't sure where I/we were going with this, and probably didn't want to offend me. He wasn't averting his eyes though, and I got the impression he was trying not to look too hard, at least at first. So she was in my lap, and I put my arm around the waist, resisting the urge to touch her too erotically. She had her legs crossed, and one arm was still covering her breasts. I wondered how long she would go with this - the first couple of times she flashed him couldn't have been for more than a few seconds, partly because she didn't want me to know. Now here she was having tea...I thought she might start feeling uncomfortable and go back to the room, and I was happy that I got what I wanted.
After sitting like that for about a minute, mostly silent, she stood up. With her breasts still covered, she walked over to the window, and peeked out from behind the blinds, giving us a good view of her ass. I was thinking about her selective approach to modesty - hiding her breasts (at least part of them), but showing her bush and her booty.
But then she turned around, faced us, stretched both arms up in the air, completely revealing herself, and announced "It looks like a beautiful day!" and gave us a big, bright smile. She could be so graceful. It was really a beautiful sight, her chocolate skin in the light filtering through the blinds, her big breasts slightly swaying, her dark chocolate nipples. And her own freedom and enjoyment of the moment made it all the more beautiful.
She then walked back towards me, still smiling, me smiling back at her, a little stunned, and she slowly bent over at the waist, slowly enough and at the right angle, sticking her ass out a little extra, that it was obvious she was showing off...picked up her cup of tea from the floor, and walked back to the bedroom.