I'm looking for a QT BL that had an intriguing zombie arc. The premise was the Mc and ML were college dorm mates and slept together before the zombie apocalypse. Later on the Mc deliberately gets bitten and the ML goes crazy and looks for him, ultimately finding his zombie body at his childhood home. If you have any ideas let me know! Gah! I literally found it a few minutes later! It's~ https://www.novelupdates.com/series/single-dog-ending-system/
Yup! That's it! If you like cute zombie shous, The Strategy of Washing Clean a Slag Shou also has a zombie apocalypse arc where MC becomes an innocent little zombie, ML is a researcher