Ino was shown attracted to Sai during their first meeting.

Ino was shown to be smitten by him and continuously attempts to flirt with him, ignoring Sakura's warnings of his social awkwardness.

During the Infinite Tsukuyomi, Ino was shown dreaming of Sai fighting over her.

Ino is triggered into rescuing Sai from Gengo, due to her crush on him and believing only she can do it.

They instinctively reach for each others hands and Sai once again calls her 'Miss Beautiful' but this time truly meaning it.

Ino shyly reveals to Sakura that she has gone from finding Sai hot to being in love with him and plans to confess to him her feelings by giving him a special flower.

Ino is shown to be concerned about Sai's safety and well being when he is on missions. She becomes angry when she finds out Kakashi sent him on a mission on his own.

Ino becomes flustered at the sight of Sai in only his underwear.

Ino is shown to be blissful about her relationship with Sai, believing she will get married much sooner than Sakura.

They are shown holding hands at Naruto and Hinata's wedding.

Sai stays at Ino's bedside as she is in the hospital, being unwilling to leave her.

They are described by Akamaru as being 'on heat' as he spots them on a date.

Ino is normally always shown to be self confident and assertive. However, only when she is with Sai and especially when he shows affection towards her she always blushes whilst becoming flustered and shy. Showing how only he can cause such an effect on her.

It is revealed in the final chapter that Sai and Ino are married and have a son named Inojin Yamanaka.

Sai is the only known male character in the series to take on his spouse's surname upon marriage.

As a married couple, Ino refers to Sai as anata ('darling' in Japanese).

They run a modern version of the Yamanaka flower shop together with their son.

They are seen multiple times holding hands. In Shikamaru Hiden (Novel), The Last: Naruto the Movie Ending, Naruto Shippuden Episode 493, Naruto Shippuden Ending 20, Naruto Shippuden Episode 500 and Konoha Hiden (Novel)

Here some photos: