[Arthur can feel himself tensing up instinctively as Merlin calls up his magic. It's not that he hasn't seen the magic before, but when has it ever been used for anything so inane as locking the door and filling a tub? Even when Merlin had used it to grow a flower last time, Arthur had been too shocked to properly appreciate it.
Pushing aside the wariness, he approaches the tub and eyes the water. When he sticks his hand into the water, he finds the temperature is just about perfect.]
To think you've been able to do this all along.
[Meaning he wouldn't have had to suffer through lukewarm or too-hot baths before. It's a ridiculous thing to be focusing on when it's magic, but he still grumbles some all the same.]
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Pushing aside the wariness, he approaches the tub and eyes the water. When he sticks his hand into the water, he finds the temperature is just about perfect.]
To think you've been able to do this all along.
[Meaning he wouldn't have had to suffer through lukewarm or too-hot baths before. It's a ridiculous thing to be focusing on when it's magic, but he still grumbles some all the same.]