Bruce has similar, if not identical priorities. Toilet, teeth, Tony, in that order. He's on step two of three when Tony comes in, too groggy to really look up from zoning out on the sink while he brushes his teeth. He hasn't looked in the mirror yet and is blissfully unaware of anything strange until he hears Tony coming in and looks up to catch sight of him in the mirror.

Holy shit seems like an entirely reasonable response to seeing a guy who sounds like Tony and who resembles him, but who is far too young to be the man who Bruce went to sleep with.

Then Bruce catches sight of his own face and pulls the toothbrush out of his mouth to stare, open-mouthed at a face he hasn't seen since Harvard. He has to stop to spit out his toothpaste before breathing, "Holy shit is right."

So, alien asparagus jizz... He is never coming back to Sakaar.