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In the aftermath of the closing of the Rift, of being Chosen by his Goddess, high on alcohol and adrenaline and power Captain Kämpfer had made a decision that was, perhaps, in hindsight, a poor one. He had commanded the only other person who knew of it to forget, but he had had no knowledge as to whether such a command would actually have the desired effect. Kuno had no idea how to correctly use the power he'd been granted, what it could do, or the extent to which he could manipulate someone.
Because of this, once the deed was done and the two men involved were curled up on one of the makeshift beds that had been abandoned in the office by themselves and the others in their squad months before, the Captain did not fall immediately into a deep slumber as his victim had. Instead he had spent the majority of what remained of the hours of darkness with his lips pressed close to Reiner's ear whispering,
"It was your fault, your idea, you made me do it." In variations, on repeat. "Your fault. Your fault."
Your Fault
This command might have been seen as a contradiction of the first but he knew from personal experience that a person could forget the details of an event while still realizing that something had happened and feel guilt over it.
Eventually the high emotion, activity and inebriation of the day overtook him and he did doze for a few hours as the sky lightened over the recently liberated city-state. When the man in his arms stirred, however, he did also. No realistic commander would be expecting the soldiers that had been released to celebrate the night before to be on duty early, but that didn't mean they would not be expected at all. As they disentangled and sat up, Kuno pretending not to remember exactly how they had gotten there, he waited, breath bated, to see how Reiner reacted.