It's not much later, in Isabella's room, that she asks:
"So... is Alex really a dom?"
Sadde and Isabella in Eclipse
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Are they far enough away that he can afford to give the couple some time for themselves and intervene when it looks like a librarian might come around and decide he wasn't doing his job right?
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Mmk maybe he should stop that. He taps the window with his knuckles and makes a 'cut it!' gesture with his hand, trying to signal the librarian's position with his eyes.
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Then he'll talk to Jackson first. If he catches Isabella's eye, he'll try to gesture and mouth a 'be there in a sec' or some such.