[ The realisation of what she's said slowly catches up on her. Peter knows fine well that Luna's not really one for uttering anything remotely close to curse words. She's said 'dingwad' a couple of times (when it was entirely called for), that she's learned from Fern. But even wizarding-flavoured usual sayings like 'Merlin's Beard' or 'Merlin's Pants' that aren't really that severe aren't something she says either.
Peter's doubled over with laughter, rolling about on the floor. Luna's sobering realisation over the whole 'on the wall' or 'off the wall' debate falls to a wide-eyed stare as she mentally utters: ]
... Oh, no. I cursed.
[ Luna turns herself towards him, her own legs sliding from the wall and ending up in a crumple heap on the floor and she rolls to reach for him. This is terrible! Awful! She cursed out loud! She never curses! She tries to hold him still for a moment, her fingers moving to cover his lips. No laughing, Peter!! ]
No, no, nooo— shhh. It's serious. [ There's still an odd smile at her lips; trying to be serious but failing — Peter's laughter over it all is still amusing to her. ] Swearing's bad.
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Peter's doubled over with laughter, rolling about on the floor. Luna's sobering realisation over the whole 'on the wall' or 'off the wall' debate falls to a wide-eyed stare as she mentally utters: ]
... Oh, no. I cursed.
[ Luna turns herself towards him, her own legs sliding from the wall and ending up in a crumple heap on the floor and she rolls to reach for him. This is terrible! Awful! She cursed out loud! She never curses! She tries to hold him still for a moment, her fingers moving to cover his lips. No laughing, Peter!! ]
No, no, nooo— shhh. It's serious. [ There's still an odd smile at her lips; trying to be serious but failing — Peter's laughter over it all is still amusing to her. ] Swearing's bad.