Magic-user prince who figures out how to enchant their knight's armour to actually be able to feel sensation, like a tortoise's shell.
Casting the spell and the knight doesn't immediately notice anything because it's not like they're touching anything most of the time, just standing guard. Sure, they "feel" when they grasp the hilt of their sword, but they always feel that, sort of a phantom sensation.
Prince testing to see if the spell worked by laying a hand on the knight's cuirass, a familiar gesture that would raise no eyebrows to an onlooker, but the prince doesn't miss the startled hiss from inside their knight's helmet, the stiffening of the figure, the shiver when he lets his fingers trace down the plate before falling to his side.Â
Prince smirking at the confirmation that the spell worked, leaning in and murmuring a tease that doubles as a question, making sure that the knight is okay with this. Knight nodding and breathlessly confirming consent, though warning the prince that such an enchantment might make it difficult for them to do their duty. A knight's armour is meant to protect the sensitive creature underneath, after all.
Prince surreptitiously taking their knight's hand, stroking a thumb over the back of their gauntlet, feeling their knight still as all their attention zeroes in on that one point of contact, and assuring them that they have no cause to fret. After all, their only duty today is to accompany their prince at the banquet that night, where there will be countless other guards to keep away any real danger. All the knight has to do is stand there, look vaguely menacing, and feel.
Prince teasing their knight mercilessly throughout the banquet, touching them far more than is strictly necessary, enough to merit suspicion from any observant onlooker, and the knight would be embarrassed even without the sensations humming through them. Knight hissing to their prince in a close moment that this is irresponsible, that the knight needs to at least be able to focus, and the prince is making it all but impossible. Prince dragging their fingertips down the inside of their knight's arm from elbow to wrist, replying that if the knight can't stay focused in the face of such distraction, then perhaps they aren't a very good knight after all.
Knight gritting their teeth and silently resolving to prove their prince wrong, painfully stoic and sturdy for the rest of the evening, no matter what the prince does, no matter how hot their cheeks burn behind their visor.