There's this random A/B/O AU alerudy scene stuck in my head as a comics panel: Alejandro finds out that Rudy is omega through one sniff, gives him a shocked face, and Rudy being absolutely horrified at the very moment knowing that Alejandro finally KNOWS
"Just done with his execution, Alejandro's hands were dripping warm with some narco's blood-- Rodolfo could feel Alejandro's heart still racing with adrenaline. As if concluding a ritual, Alejandro hugged Rodolfo right after his final kill. An act of promise."