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Severus assumed Potter would be like James. Instead, he took after Lily.
He thought Potter would die, they both would. Shockingly, he survived, they both did.
Severus believed Potter would never forgive him. Yet it was Harry who reached out to put the past behind them.
He knew there was no chance that Harry felt the same way that Severus did. Startlingly, it was Harry who made the first move.
Watching Harry ride him, head thrown back in pleasure, crying out Severus's name as he came turned Severus's world upside down.
Maybe, just maybe, he'd learn to expect the unexpected.