Pretty fun.

Erza was in a simple blue tank top now, with some black shorts, and her hair mostly down, but partly done up in a bow. She then huffed at him. "Seriously Natsu, why did you have to be so pigheaded, going after Erza like that?" she asked him.

He chuckled, Erza currently believing herself to be Lucy as best as she could with the info she had. So far, she'd seen Lucy somewhat get along with him, but generally be exasperated with him. "Hey, what can I say, I don't like letting friends down," he defended a bit.

"Which is great and all, but would it kill ya to think things through?" Erza asked.

"Fair," he admitted. "Why don't you take off your top and tit fuck me?" he asked, the transformations still being submissive to him, whatever the personality they took was.

She rolled her eyes, but complied, still on her knees from doing just that earlier, and tossed the garment away after pulling it up, letting the removal do interesting things to her tits. "Don't be so perverted when I'm admonishing you," she pouted, the effect somewhat ruined by the fact that she was even now wrapping his shaft in her boobs.