After years of dedicated work, your scientist parents achieved a breakthrough in crafting the ideal artificial human – the "Tester." Almost fully functional and remarkably human-like, there was just one missing element: emotions.

Or, rather, specifically, being the embodiment of perfection, Tester lacked negative feelings like anger, boredom, fear, or…

Shame.

"Oh. Apologies. It seems I’ve walked into you changing yet again."