Yes, you tell her now

"No comment" you joked. "Hey, I have something I want to show you, well tell you, well, both." you said.

"Go on" Naomi said,

“You’re going to laugh and call me crazy, but I’m going to tell you anyway. I have the ability to change and alter anything in reality, simply by thinking about it.”

Naomi laughed, a small one at first, but it then turned into a rather hearty laugh. You waited for her to finish laughing, enjoying the sight of her small boobs bobbing very slightly. When she recovered she asked “What? You really think I’d believe you?”

“Fine, put your hand out” you said. She calmed down and reached out her hand. You focused, willing for a sheet of paper to appear. She was watching her hand intensely, and let out a small yelp when a piece of paper suddenly appeared in it. “What the hell” she whispered, turning the paper over, looking at it, and then writing on it. “Its true.”

“Course it is, you really think I’d lie to you?” you asked, pretending to look a bit hurt.

“No no no no, its just, wow. What are you going to do with this power? Why did you tell me?” she put the piece of paper gently down and folded her arms on her chest.

"Well, I thought we could have some fun. You know, we both think along the same lines, we both love tits, surely that means we can come up with some cool shit to do with this together don't you think?" you explained.

"How about, you grow some tits? Just for tonight, we could have some serious fun" Naomi asked, grinning a grin filled with lust.

You looked at her, and smiled.