Michael wasn't too impressed that Ollie was his dance partner after they were accidentally paired up together. Michael found him to be weird, but Ollie liked Michael's company. In the end, Michael grew to respect him after he befriended Ollie's sister, Farfalla. After this, Ollie and Farfalla were never seen again.
Faralla is Ollie's sister. Their relationship isn't developed on the show; it is only revealed that the two are siblings. Michael had to hang out with Farfalla while Ollie had to go pray to the moon.