SPOILER WARNING AHEAD: This is from Volume 83 SBS Link below from APforums for reference:
APPARENTLY DOFFY AND VIOLET HAD AN AFFAIR!!! THE HELL WITH THAT!!!!
The transcript is as follows:
Q: I love Dressrosa arc and re-read again and again, but there is one thing I can't understand enough. Why did Doflamingo and Viola call each other "Doffy" and "Violet" in chapter 788 where Viola confronted Doflamingo? What did they think at that time?
What are your reactions and comments to that?