Nalan Mingxue. And it's a bit obvious. She stepped forward knowing he won't say no to her. Only one person has this much confidence around him. She seems to always have him figured out. That rescue mission with the rocket launcher when they were much younger would always have a sweet spot in her heart.

It's obvious when you do a little analysis. Of all the girls, only Mingxue had him figured out. There's also that rescue job with the rocket launcher. That surely left a deep impression with her young heart.

she did have first dibs on his short sword.