The way O.B. just waits for Loki and Mobius to stop bickering instead of intervening or saying something... he knows. He saw them for two minutes and felt very well what was between them.
Casey being so happy and excited when he finally met O.B. and O.B. being so happy and excited when Casey told him he read everything O.B. wrote. they literally forgot they were about to die at that point. give these two their own spin off where it’s just about their friendship and them being wholesome together. protect them at all costs