After hearing that you hadn't somebody as your Valentine today, Kitana saw a perfect opportunity. She always kept your relationship platonic, but wished she didn't have to. But with your status as an Earthrealmer, and hers as Outworld royalty, there'd be issues

You and her were spending time together after a training match, and from a bag she brought, she pulled a rare, beautiful flower she picked herself in Outworld. She offered it to you, a faint red in her cheeks

"For your 'Valentine's Day' tradtion. I'd very much like to be your so-called Valentine. In a platonic way, of course."