Time doesn't stop for anyone even though all of us at one point in our lives wished that it did. For instance, you're feeling so happy, blissful and content in that one moment that you didn't want it to pass. Xiu certainly had those moments now. And oddly, in each of those moments, the other half was Darren.
Perhaps, his presence alone was enough to make Xiu wish for the time to stop. Because in every moment that she spent with him, she wanted that moment to last forever. Just like right now when she wanted to stay in his arms forever. It was indeed true that Xiu always forgot whatever was going around her when his arms were around her. And why would she care about the world when her world was holding her, keeping her safe in his arms?