Ah Shikaino, there is so much to say about the two, well first of all, their families go way back to the time when they were not even born yet. In the beginning of the series, Ino and Shikamaru are waiting to be put in a group and right after, she said that she would hate to be in shikamaru's group. She then gets paired up with him and Choji and he says, "Ha, Didn't you say something about hating to be on my squad" in a very flirtish tone. Then, in the forest of death, when Sakura is about to get killed by the sound ninja, she, Shikamaru and Choji rush to block her from the attack and Ino appologizes to Shikamaru and Choji for draging them in this and says, "Well, we are a three man squad after all, all for one and one for all".Shikamaru replies, "Ya whatever happens will" and agrees to work with her to save Sakura while Choji says this was suicide. In Ino's fight with Sakura, when Shikamaru realizes that she was going to use the mind transfer jutsu, he says "She's only supposed to do this technique with me!" in a concerned tone which shows that he cares if she goes on to the second round or not. To the chunin exams, Ino then goes and acts as his personal cheer leader, which slightly annoys him but in a good way.