Nero gives a practical answer, and whatever complicated feelings lie behind it, V can only take him at his word. It's disrespectful to do otherwise. He will not assume where that leaves them. Being on the same side is the bare minimum for remaining civil with each other. It says nothing to what their relationship might be here where there is not a common enemy that urgently must be fought. Whatever Thirteen is, even should V be able to defeat her, that might only spell his death and the end of Vergil's life with Nero.

It's not time yet for V to ask questions. He offered to answer questions for Nero, and the next question is entirely reasonable. If V hadn't spoken with Vergil yet or if Vergil said nothing of the matter, Nero would be in the position to reveal the truth to V—the alternative being to wait for Thirteen to do so. It's too shocking a revelation to be left alone.

"When we first met, I knew you had to be a Sparda," V says. "I assumed at the time you were Dante's. After speaking with Vergil, I know I was wrong."

He words it carefully, neither claiming nor rejecting Nero as his. He's had days—days!—to think about it, and it still confounds him. Oh, not how it happened. He understands when that happened, but what it means for him and Nero? It elevates the uncertainty between them to a whole new level.

V looks over at Nero. "Foolish though it may be, it was more confounding to learn than anything about this place."