I'm sure Adele didn't have to act too hard at being turned on in that scene!
But her character Floriane has too much invested in her sexual power over boys to release her iron control of, and cynical detachment from, her real feelings; so she gives Marie a treacherous brush-off, and winds up dancing with herself, a cold blue light underlining her icy narcissism, smiling smugly about...something, with the boys all giving her a wide berth.
Marie, who has so bravely forced the issue, simultaneously realises that she really is gay, and that Floriane will never return her love; unlike her straight friend Anne, who obviously does love her, and who she has come so close to dumping for Floriane. The one line, "You sure she's waiting for you?" shows that Anne knows very well what the score is; but unlike Floriane, she does not betray their friendship, and one doubts that Marie will be going back for any more horrible wounding.
That's how I read it, anyway
So yes, the kiss .gif is hot, and very beautiful, but it's still a tragic scene.
Fish, the jump at the end of the gif might just be an opportunity...try morphing between the last and first frames, over about half a second?
"To learn who rules over you, simply find out who you are not allowed to criticize" - Voltaire