Corey holds the honour of being the first boy in Lawndale to ask Quinn to go out with him in the first episode "Esteemsters". Quinn states in "Love is a Way Too Many Splendored Thing" that "He has a special place in my heart, behind all the other guys who have nicer cars".
He has the bad fortune of asking Quinn out when she has to write an essay in "Quinn the Brain", thus having the door slammed on his face when he shows up. He seems horrified at the idea that Quinn would do any work and may think that she is being held against her will.
He doesn't appear after that except as a backgrounder: the "Oh, the Obscurity!" flipbook says "he lost favor [with Quinn] and was demoted to background character". (In one case, he is shocked and traumatised in "Is It Fall Yet?" by Quinn answering a question)