<I did not. All your actions were your own.>

He makes frustrated lizard noises. "You tricked me!"

More confusion. <You knew that fish do not exist out of water and that I cannot create solid things, you had all the necessary information to infer the fish were not real.>

"I don't know what you can and can't do!"

<I can see the future, move things with my mind, and project my psychic song.>

"...How do I know you're saying the truth?"

Extreme confusion. <I do not lie.>

"But how do I know that?"

<By observing that everything I say is true.>

"... I guess."

<Why do you think I would lie to you?>

"Michael said that's what big sisters do."

<Excuse me for a moment,> she says, and telekinetically opens the door then picks the path that will most quickly lead her to Michael.

As it happens, Michael is playing with his sister. Well, cousin/half sister, but who's quibbling. 

Michael is picked up, dragged up until they're not underwater anymore, and shaken in the air.

"Ahhhgfhghgh! Whhhhhhhy?"

<You have told my brother that I lied to him. You were mistaken.>

"I just said that's what big sisters do!"

<I am his big sister. I do not do it. Therefore that is not what big sisters do.>

"Mine does!"

<If your sister does not like you, that is not my or my brother's problem. Please do not offer him advice again.>

And she releases him.

He immediately surfaces. "Hey, my sister loves me!"

<Then why does she lie to you?>

"It's like joking."

<No, it is not.>

And back she goes.