Tiana realises that the elf has a similar purpose to her; to protect the world from the dark god's artifact, not to use it for their own wicked purposes...
She feels actual sympathy for the elven noble.
"Does that make you resentful? A defeat by a race you consider 'inferior' and failing to satisfy your arrogant pride?"
"You suffered defeat, because you looked down at your opponent. And it seems you are making the same mistake now!"
"W-what?" Liabella gasps softly.
"My duty is to secure the artifact, and cleanse it...just like you. You think only elves can do such a sacred thing?"
Liabella bites her lower lip as Tiana presses on.
"You're just a pompous, smug elf girl, eager for self-pleasure." Tiana snaps at the tearful woman.
"Don't you dare to me like...mmpgh!" Liabella can't even finish before having her lips covered by Tiana's, who is unsure of her complex, difficult feelings as two soft tongues press against each other, leaving Liabella's eyes wide with surprise.
And yet, neither push away.