It’s so incredibly ridiculous to claim ownership for things like Emma’s bug. Like hot chocolate and cinnamon are strictly a Charmings thing, or sharing rum is only a CS thing. That is the kind of thinking that leads to petty ‘shipper wars. And I seriously hate petty ‘shipper wars. OMG, ‘shipper wars in general can get so ridiculous.
Emma has a car. She uses it to get around, it’s a car, it’s hers and if she wants to invite Hook in it — she can do that because it’s hers.