Please spoiler stuff that's new to the current release (in this case, to 0.4 and 0.4.1, since the latter doesn't advance the storyline).
He said flat-out that Lucy would get veto power, and that is her home now, too. She's his partner and first girlfriend, not just another harem girl. He also said that current girlfriends get veto power over new girlfriends. Since Lucy's the only girlfriend so far, Victoria does in fact need her approval. Once Victoria is a girlfriend, the next girl (Akatsuki or Sarah, most likely) will need both Lucy's and Victoria's approval. And so on, and so on. You're just getting a bit ahead of the plan, but this plan was stated pretty flat-out during the game.