There were many popular works in Baihe animation that could be used as reference:
1 "Like Is Like"(alias:Ouran High School Host Club)
2. The Light Girl (alias:The Sound of Feathers)
3 "Even a chuunibyou needs to fall in love!" (alias:Ouran High School Host Club)
4. The Weird Student Next to Me (alias:Ouran High School Host Club)
5 The Other Side of the Realm (alias:Ouran High School Host Club)
"Even a chuunibyou needs to fall in love!" Lover×Lover-"(alias:Ouran High School Host Club)
7 "RE: Life in the Other World from Zero"(alias:Ouran High School Host Club)
8. The Light Sound of Girls (Movie Version)
9 "Even a Sophomore Must Fall in Love!" Ouran High School Host Club
10 "The Other Side of the Realm"(alias:Ouran High School Host Club)
The above are some of the more popular Baihe anime. I hope it will help.
As I don't know the actual 'l o'brien' romance novels, it's hard to say. But generally, romance novels often have elements like a central love story, character development of the protagonists, and some sort of conflict that the couple has to overcome.
I'm not sure which movie you're referring to. If you can provide more information or context, I will try my best to provide you with a more accurate answer.
Some authors or their official websites may also provide free audiobook versions of their novels as a promotional tool. So, it could be worth searching for the official website of the S O W L E S novel to see if there is a free audiobook available there.