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"The factory, huh?" Twilight repeats, her gaze following the indicated direction. It's too distant for her to make out any specific details, other than the ominous blackness of the whole thing, but she can tell from the direction that the rainbow juice is flowing that they must be connected. "Oh, I see... She was saying something about a Rainbow Factory... how do I get in there, anyway?"
She turns, to see that a curious look has crossed his face. "Umm... I don't know. I don't really know anypony who's been in there, and the ones who come out... Well-"
Before he can continue, they're both engulfed by the shadow of a much larger pony in a serious looking black suit. It doesn't look like he's dressed formally... It just looks like it was designed to intimidate. "What's going on over here?" He asks, calmly, although it's clear he's trying to mask his disapproval of the worker's unscheduled break.
Before the worker can come up with a response, Twilight takes a step back, and offers a nervous bow. "I'm sorry, it was my fault. I was just looking for directions into the rainbow factory."
"Only certified weather factory managers are allowed in there. Even with the Princess's approval, we couldn't let you in." His response had been sharp and immediate, as the worker shrinks back, and quietly gets back to work.
Twilight nods in apology, and turns away, wondering how it was that Pinkie was able to get in. Before she can get too far, a curious little dragon pipes up.
"Hey, what are rainbows made out of, anyway?" Spike asks, earning a very brief look of alarm from the site manager.
"Princess Celestia would not be happy if she heard about her prized pupil getting involved with business that doesn't concern her. Go home, Twilight Sparkle."
And with that, Twilight and the manager trot away in opposite directions, each muttering mutually exclusive things about each other.

While walking away from that alarmingly abrupt brush-off, Twilight Sparkle wonders in her head what could be going on here. Pinkie's inside the rainbow factory, but nopony who isn't certified is allowed in? There's something going on here, and something in that suit pony's voice had been telling her she'd be at the bottom of a lake with concrete horseshoes if she looked into it.

"Spike, you'd better hold onto me. I'm going to use a couple of easy spells on both of us, but there's a thirty percent margin of error, so we can't afford to get separated."

More like sixty percent, she thinks to herself, as she can feel his grip on her back tighten. But he doesn't need to know how dangerous it is to teleport into a room you've never seen before. You'd have to imagine a room that might look like the target, so the possible list of screw-ups is endless.

But first, to get to a workable distance. She gallops at full speed towards the menacing black cloud, preparing for a face-off with her crazy friend.

Not wanting to be spotted on the way there, Twilight has already cast an invisibility spell on both herself and Spike. She's actually never used it on Spike before, and since, his grips been almost tight enough on her to cut her. Finally, she stops right on the outside of the cloud, and closes her eyes. She has no idea what the inside of this facility looks like, but luckily, she has one ace up her sleeve. It's not a loophole she likes using, but every building has to have one, and it isn't hard to imagine what one would look like if it's being used by important high ranking officials.
She pictures a bathroom. A fancy, pegasi friendly bathroom. And she teleports there.

When Twilight Sparkle materializes, she breathes a sigh of relief for the fact that she's right where she'd intended to end up... In the middle of a fancy, platinum restroom, with stalls that looked wide enough to accommodate the stretched out wings of pegasus ponies.
"Spike!" she calls out in a loud whisper, not feeling his claws on her back. They're both still invisible, so he can be anywhere... He could have materialized in the middle of a wall, for all she knows.
"I'm right here," he whispers back, as a stall behind her opens up and closes, seemingly on it's own. "Did you put me in the toilet bowl on purpose?"
"I did not, just... Just get on my back, okay? we need to go find Pinkie Pie."
For an invisible baby dragon to climb up on the back of an invisible pony isn't an easy thing to accomplish, but they finally pull it off, as they quietly leave the restroom... And wind up directly on the main Rainbow Factory floor.

Twilight carefully closes the door behind her, glad that nopony's seen them yet. Not far off from her, she can see scores of pegasus youths standing in a huddle, at the foot of a giant machine, with a couple of suited pegasi giving them a speech from above. Curious, she moves a little closer, and waits to hear what's going on.

((Who the hell goes on tours in a secret factory?

It's a bunch of ponies about to be used for rainbow juice.))

Twilight's eyes narrow as she sees Pinkie walking past her. "Pinkie!" She calls out, as she lets her invisibility spell slip away. She trots after her, deciding that what she's just heard from her pink friend is just another bunch of nonsense. She forgets to undo Spike's invisibility spell.
"We need to talk."