Theo squeezed her hand back reassuringly. Even if it weren't "Ministry-approved" he would be marrying her, one way or the other. Well, depending on just how far Pansy was wlling to go with things.
He gave Pansy a slight shrug when she looked at him; of course it was her option. They hadn't had a chance to discuss it, but they would. He would never ask her to perform any bit of magic she wasn't comfortable with. The simplest bindings were reversible, with mutual consent, anyway, though he was most familiar with the blood-based variety. He could look up the 'nicer' ones though.
Millie caught his sigh. Theo thought he heard something, but a keen look didn't derive anything so he relaxed. Millie knew what Draco was thinking about, though--or rather, who. After last night, she knew he was going to be pissed--and under the anger, probably hurt.
Theo could feel the relief in Pansy when Draco finally congratulated them. "Thank you both," he said. It meant a lot to Pansy, he knew. And Millie's meant a lot to him.