Bimbo

To transform Victoria into a bimbo you need to talk to Candy. Candy is one of the Brothel girls marked above, if you don't know how to unlock the Brothel content see the first four quests here,First quest, Brothel quest. After you've unlocked the brothel you need to talk to Candy four days in a row, the three first times she will ask Victoria these questions.
Like, what do you think *giggles* about sucking cock?

1. I kinda like it.
2. Ignore

Like, Victoria what do you think about my lips?

1. Beautiful.
2. Ignore

What do you think about my tits? They're not to big right?

1. Like big tits.
2. Ignore

At the fourth encounter if Victoria answered 1 three times she's forced to follow Candy. If Victoria ignores Candy all or one time she gets to choose if she wants to follow Candy or not. If Victoria follow Candy she'll give her a bimbo potion. Victoria can either drink the potion herself or trick Sarah to drink it during this quest Getting even. Right now version 1.6.4 there's no bimbo scenes for Sarah. All bimbo scenes for Victoria can be found under this header in the sidebar.