Love the ending. Nicely done.

Heehee! Cute!

Thanks!

Bwahaaahaaa! Oh, lord, that was really a power in the comics? Well, at the very least, it helps with keeping his secret safe!

Yeah, it was really a power. It was pretty useful when Supergirl was around; they could just talk to each other over long distances. Though I guess they could do that with their super hearing anyway. Hmm...
Here are a few examples of the power in use:
Super-VentriloquismMore Super-VentriloquismSuper-Ventriloquism... In Space!LOL! This is funny. And I can actually see how it could be "super" useful :P
I'm glad the humor came through. I had the whole first section written for a while, and I had a hard time coming up with a good way for Superman to address the super-ventriloquism that wasn't a totally boring info dump.
Your story aside, though, I would question whether it is the least useful superpower, even in the comics. How about shooting rainbows (as seen on the cover of Superman #125 - original series, below) or a mini-me (as seen in that same issue's story) out of his fingers? Those are powers that, thankfully, did not last.
I have that issue, but it's been a while since I read it. There were a few times that Superman got rainbow powers back then. I think twice he shot rainbows from his fingers, and once he had a circular aura-type rainbow hanging around him. I forget exactly how it happened. I think he was exposed to some sort of alien substance.
I don't actually think that super-ventriloquism is useless. It has a lot of potential, but it tended to get used for things like letting Clark talk (while hiding his mouth) when he had been exposed to red kryptonite that made fire shoot out of his mouth every time he opened it. (in Action Comics #283)
I don't know, Lois. That seems like quite a useful superpower to me.

Well done. I love how Clark... excuse me, SUPERMAN demonstrated that power and Lois never even noticed. This would've come in very handy on LnC. Too bad they never picked it up. I wonder how one discovers such a hidden useless power.

Yeah, one personality trait Superman has that seems pretty consistent across portrayals is that he loves messing with people. And he's being completely literal: "it
sounds like Clark is here." And then Clark insisted that he arrived right before she opened the door.
It would have been pretty handy when Clark was trying to pretend that Superman was staying with him during the heat wave. I can picture him making some smart-alec comment when Lois quietly asks Clark if the suit actually comes off. He could yell from the other room, "I do have super hearing, you know!"