Markshenley
Sai wrote Sakura a romance novel and she wanted to experience it first hand. Enter Naruto's sealing expertise.
"I guess I'll be joining you, though I don't know anything about the story," Naruto rubbed the back of her head, clearly rolling with the situation, "quick tell me my roll so I don't mess it up for you."
Sakura was a little embarrassed to say it out loud but knew that Naruto was the least judgmental person she knew, "It's a love story between Sasuke and me and you are the villain."