The Pet makes more unintelligible grating noises, and leans into the scratching with enthusiasm. This wouldn't work if Saber hadn't had gloved hands, but unfortunately for at least 1 party involved in these scritches, when the pet responds with enthusiasm, it's like having a very energetic elephant suddenly demanding your attention and pressing into your tiny, fragile hand.

Oh, and that elephant is made of super-durable alien metals.

Enjoy the affectionate, alarming, vaguely spazzy headbutting~~.