Help me find this manga

There’s a doujin of Eren and Levi in an omega verse, it’s 3 chapters long and Eren is an omega who hates alphas, expect for Levi. He’s a kid, like a high schooler..... or something like that. I thought the name was Love letter, but I can’t find it....
Someone plz help
Σ(っ°Д °;)っ