It’s not that deep, man… it was just supposed to be a hot and funny moment.
Besides, you’re missing the whole point. That was her way of releasing the sexual and mental tension she had built over the photoshoot. She was feeling self-conscious since she’d never done something like that, posing and spreading for the camera for a guy she liked.
She eased up a lot during the process, starting off shy and uncomfortable...
...but gaining confidence as the session went on.
This is something I commend the devs on, the use of expressions to convey the character's feelings well.
Ultimately she still snapped and ran away because of all the embarrassment, precisely after going full spread eagle.
The scene actually captures Bree’s spirit perfectly, spontaneous and adventurous with a dash of bashful.
She’s not a dummy