Not me Not she Not him It’s all about

I am a space for privacy, but cubes sometimes have gaps in me. Powdering nose or natures call perceived, going there may leave you feel relieved.

Wait for it... Wait for it... Wait for it... Waaaaaiiiiit... And now you have your answer.

Take cover when I fall, Or suffer shock, I'm often spotted, When shotguns are cocked

Open me to view, what comes only to you. My physical form envelops, an enveloping thing or two. A post has thrice the meaning, counting E into the loop. I hold up my arm, it works like a charm, my contents are sent through.