[Happiness, plain and lovely, fills her system as he kisses her back. If it really had been a joke, a lie, then he would have pushed her away. The fact that he didn't, that he instead returns her acts of affection as passionately as he does just serves to show her that he reciprocates her feelings.
Joking about his brothel visits with Jae-Ha aside, she never really saw Hak as someone who plays around. Especially not her, not like this, not when he's carefully kept his distance from her for all these years.
Her breasts pressed against him, she can feel every vibrating heart beat, steady and strong, both his and hers. They seem to beat as one, connecting their owners in a way Yona had never considered possible before. And now she can barely think, so lost in the feeling of him, them, only separated by thin pieces of fabric.
She keeps kissing him, her lips exploring every millimetre of his, as if to make up for lost time. With her eyes closed she concentrates just on him, on the way his hands feel as they press to her lower back, travel to her thigh and hair. Even the tiniest of touches seem to burn on her skin, a feeling she craves more and more.
As she breaks the kiss to catch the breath she hadn't even noticed she'd been holding, she traces the curve of his cheek with her fingertips, her palm coming to rest on his face. Meeting his eyes again fills her with bliss but also makes her heart skip a beat or several. Her face is flushed as she looks at him, a smile spreading on her pink lips.
A thought enters her mind suddenly but there is no doubt in her mind that it's the right thing to say.]
Say my name ... please ...
[She herself had asked him to keep reminding him that she is the daughter of King Il, to be the one to see her as a princess, even should all of Kouka view her as nothing but a faint memory. But now she realizes that hearing her name spoken by these lips, who kiss her like she is the most precious person to ever have lived, is all she wants. She doesn't need to be princess if only she can be his. They can remember together, not even be parted by something as insignificant as a title.]