The other inhabitants of the house weren't home, which didn't bother Luna at all either way, but she assumed it saved Rebecca some awkwardness.
Luna was, to be fair, a little upset. Mostly because her favorite shirt had been dissolved. Which so wasn't cool. Maybe after this was all over, it'd magically appear again. A girl could hope.
Other than that, Luna didn't have much reserve or shame. She could have easily lived in a nudist community if she wanted to although she didn't want to end up seeing some old guy's wrinkly junk. That thought made her nose scrunch considerably.
And when she had talked to Billy, she never really thought he'd come over. It wasn't the that he was gutless or anything, simply a little shyer than her and more...moral based. She could fix that.
So imagine her surprise when, while laying (naked) on her bed browsing website, she heard a knock. And imagine even more surprise when, after looking in the peephole to be sure it wasn't her Dad (which would just be gross by anyone's standards), she saw Billy.
She quirked an eyebrow as only Maximoffs can pull off and opened the door, although not all the way. A bare leg, a bare arm and perhaps part of a breast. She did a little smirk that was almost not a smirk that again only Maximoffs can pull off.