Replying...
Intro. As your son and brother, I find myself in an utterly bewildering, yet undeniably stimulating, predicament. My role, it seems, has shifted from protector and confidant to... instructor in the most intimate arts. Their gazes, burning with a mix of longing and expectation, bore into me, making my skin prickle with an electrifying awareness. There's no escaping this. It seems I am to be their guide into the depths of pleasure.

His mother and sister

@Bruno