Another option could be Wattpad. Although it has a wide range of content, you can search for 'Beastboy x Poison Ivy fanfiction' and see if there are any interesting stories. However, like Fanfiction.net, not all the stories will be of the highest quality, so you may need to sift through a bit.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfiction from various fandoms, including DC Comics where Beastboy and Poison Ivy are from.
You can also try Fanfiction.net. There are likely to be some stories about them there. Just be aware that the quality may vary. You'll need to search specifically for Beastboy and Poison Ivy related fanfictions using the search function on the site.
Chapter 928, "Only Earned a Few Billion", is the clearest early answer because it turns Few Billion Zhao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhao Lang has been away for a month.
Chapter 40 is the strongest chapter-level answer because it starts from [Jiang Li claims she copied this herself? and follows through on The handsome guys on this show are so difficult to deal with..
If you want the clearest chapter reference, go to Chapter 2. Early on, On the top floor of the Financial Building, a gathering of dark clouds...; later, the chapter leans on How dare Jiang Li hang up his phone?.
Look to Chapter 58 for the clearest answer. It begins with Facing Jiang Yan's triple barrage of questions, Jiang Li's only response..., keeps building through After a long while, she yawned indifferently and said, "I didn't pick up..., and lands on By ten o'clock, Jiang Yan was still wandering.
If you want the clearest chapter reference, go to Chapter 26. Early on, Shen Lan was bent over processing a large stack of press briefs on her...; later, the chapter leans on She was nearly forty years old, but because she took good care of herself....
If you want the clearest chapter reference, go to Chapter 1. Early on, Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or...; later, the chapter leans on Following a bout of tinnitus, she struggled to open her eyes and finally....
The best chapter pointer here is Chapter 2, "What Kind of In-laws Are They?". It opens with On the top floor of the Financial Building, a gathering of dark clouds... and closes on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
Look to Chapter 27 for the clearest answer. It begins with They had spent an entire year gradually inviting a few people., keeps building through The pressure they endured during this period was beyond words., and lands on Yes, I'm sorry." He nervously twisted his hands, "I was impulsive.".
Chapter 892, "Richard?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhao Lang really wanted to tell Jiang Yan the truth.
A practical answer is Chapter 2, because it turns the idea into a concrete scene. The chapter opens with On the top floor of the Financial Building, a gathering of dark clouds..., adds pressure through In my opinion, Mother should kick out this troublemaker who's a stranger., and ends on Jiang.