Filir'a and Minfilia was actually Min, just before he stormed the Castrum. But he'd made his feelings known long before then, because of course he did. Fil hasn't had anyone as of yet since Minfilia. ; n;
With Thancred, however, Rahera initiated the kiss after they had a heartfelt talk on the First in Rak'tika. It was very long overdue. With Oyuun and Kat, my partner & I agree that Oyuun initiated in Azys Lla, after confessing his feelings, but Kat turns it on him, kisses him, returns to battle.
Aymeric kissed Rahera first after she confessed her feelings to him, but with the gentlest kiss, and let Rahera take control of the moment. Estinien kissed her out of frustration that she felt her life was disposable (after Ysayle's death). It was not gentle, he was trying to reignite her fire.
That moment when Endwalker came out and Rahera's Echo gift of what I call "enhanced empathy" was ENTIRELY too perfect for the whole expac. Lemme tell you, Endwalker was a TIME for her. She found put just how strong her will and heart are.