Hmm...."Irish Eyes"-related fics - hmmmm...
Well, the first one that comes to mind is ML Thompson's
The Strongest Magic . Patrick wants Lois to be his and he'll perform a magic spell to make her his. His Druid magic confounds Clark. Not to worry, it all ends happily.
Barb Pillsbury explores the L&C breakup in her
Tarot Truths . Extra points for having Star, our favorite psychic, in this fic.
There are two shorter fics listed in the Database:
Not Together by Jed Erick Henrie and
Prelude To An Auction by Lote. I must say that I like MLT's fic the most of all the ones mentioned in this post.
There really aren't a lot of fics related to this episode; perhaps because it comes at a low point in the romance, and who would want to write about that? It's difficult to write a fic about L&C being apart - you pretty much have to write about them coming back together, and that could be angsty and no fun.