In Three Men and a Mae B., Nicky asks Dawn for advice on to write a love letter to a girl he likes, who turns out to be Mae, to Dawn’s horror. Throughout the episode, Nicky “accidentally” keeps bumping his head so Mae can help bandage him up. By the end of the episode, it turns out that Nicky just likes Mae because he reminds her of their mom (healing him when he’s hurt, being nice to him), and then immediately does not romantically like her. Nicky and Mae are shown to have a great friendship throughout the series though.
Mae is sometimes grossed out by Nicky and his brothers in the first season, but usually likes him as a friend. After she finds out that Nicky was her her secret admirer, in Three Men and a Mae B., Mae is disgusted, as she has no interest in him or his brothers.