Episode 4 of the second season
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Louise and Saito do get married :D Season 4 episode 12. They also get married in Season 2 episode 12 but they had seemed to have forgotten about that just like they forgot they made Louise the Queen's sister.
They kiss in episode 16 and episode 33
they dont actually kiss but in episode 4 its like a kiss he has to kiss her to get medicine in her mouth and in episode 8 he kisses her on the nose and episode 24 he kisses her on the neck
There is no first episode that Naruto and Hinata kiss because they don't kiss.
No, there is not a 26th episode of Itazura Na Kiss.