"I'm just glad Lyra didn't catch wind of what we were doing," said Twilight, walking while shaking her head. "She's been so human-crazy about finding a way through the mirror in the castle again ever since Starlight told her about it. Thankfully, the security spells around it stayed intact while we were gone, or we'd have another mess to clean up."
"One trip into humanworld is enough for me," said Tempest Shadow, who had not missed one step while walking at Twilight's side even as she scanned the immediate area for threats. "A little fun, admittedly a challenge, but having everything smell like dog?" She gave Spike a quick and friendly fin-noogie and hip-bump that nearly knocked him over. "I think I prefer your fiery little friend, even if he does smell like smoke all the time."
"Hey, just be glad you kept your own forms," said Spike. He straightened his fins and trotted faster to catch up with their rapid pace. "Being a dog around humans is no fun at all. Other than tummy-rubs," he admitted quietly.
"Well, you'll never have to worry about that particular portal," said Twilight. "I closed and locked it solid once the nice guard was through. Although Lyra..." She stopped suddenly on the Castle of Friendship's steps and looked back at the scattered collection of Ponyville residents who had shown up for this week's entertainment. "Do you see her?"
"Nope," said Spike, scanning the ponies for a particular shade of green. "Don't see Bon Bon either, and she's always around."
"S.M.I.L.E. kits have an advanced invisibility generator," said Tempest, who was also busy looking. "And there may have been a few straggler monsters left hiding in the human town somewhere. Do you think the two of them—"
"Yes," Twilight said while turning for the castle again. "We'll give them two weeks to do any S.M.I.L.E. work that's left over with the humans and one more week for playing tourist, then I'll open the portal again and drag them both back here by their tails."
When he got back to his police Suburban, Sam took having a unicorn sitting in his driver’s seat in stride. And the other pony turned out to be an exceptional cook for the few weeks that they stayed, so it really was not all that bad at all.