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Despite what people may think the scene when Ahiru and Fakir kiss is not an episode. Rather, it is a promotional trailer for the series. If you search "Princess Tutu Promo" or "Princess Tutu Promotional Trailer" you'll find it easily.
they have their first dance in episode 6 but only dance because they were asked too.
Episode 12. Highly reccomended.
Episode 8- The Warrior's Fountain
Im not so sure, because in the end Ahiru is a duck forever. But she stays with Fakir till the end. I say she chose him when she was a Girl, though.
Ahiru likes Fakir (and i think Mytho) Rue likes Mytho Mytho likes tutu (i think Rue too) I think that's it
Duck dances Sleeping Beauty with Fakir in episode 6, and Duck dances her grand pas de deux in the lake of despair with Fakir in episode 25.
In the second to last episode(episode 25)
She originally loves Mytho, but as the series progresses, she chooses to support Rue and Mytho's relationship, and instead seems to build a strong relationship with Fakir.
Fakir likes/loves Ahiru. But Ahiru likes/d or loves/d Mytho. In the end, Rue and Mytho end up with each other, and Ahiru turned back into a duck. Unfortunately, those two never got to end up with each other, but I think in my opinion, that Ahiru started to have feelings for Fakir, as he was by her side all the time, even though she was a duck :) Spoiler: In Act 25, Ahiru falls into the Lake of Despair. When she is rescued, Fakir says he wants to "protect you and Mytho with my own power, even if I use up all my power!" Fakir wants to protect her, and in fact left the story he was writing to go and save her from despair. She worries that she won't be able to study ballet anymore as a duck, and he says that he will always stay by her. Afterward, Ahiru mentions that "Even though I had just thought it wouldn't matter if I disappeared... I wonder why? Somehow, Fakir makes the weak me stronger. Always..." and regains her will to continue the story. I think this is a relationship that has developed throughout the series, and even though it never got to mature, there were real feelings on both sides.
Episode 21 (towards the end). Don't be fooled by impartial episodes though. I found it difficult to find online. Best of luck!
Sadly, Duck and Fakir never kiss in the show. But if you want to see a really romantic pas de deux with the two of them I suggest episode 25.