I like pubes that match the girl.
In incest games by example, too many time the repressed mother that didn't had sex since more than tenth years and act like she will never ever had sex again, have a perfectly blade pussy... that absolutely don't match the character. Cleaning her pussy is a question of hygiene, but shaving it is a question of seduction, so something that don't cross her mind and shouldn't be done.
Something like what
@SeventhVixen said feel more natural. At first the mother have a untrimmed bush, then she start to take care of it, trimming it, when her sexuality start to wake up. This simply because she no longer see her pussy as a simple body part, she now remember that it's also a sexual organ and that it's part of the seduction game. She can also go for full shaved pussy if she think that her son is more attracted to young girls that to mature one. It became a way to go back to a pre-pubere state, and so present herself as younger than she is, with the hope that he will please her son.
Like I said above, it's part of the seduction game. A girl's bush should express what she want and how she feels about sex. In a time where every girl (relatively speaking) have a shaved pussy, having a shaved one yourself is a lack of imagination and perversion ; once again except if it's a oldest character since, in this case, it's go back to pre-pubere state.
So, still by example, the rebellious girl should express her rebellion and freedom in regard of sex, by being the nearest possible to "au naturel". Just because it's the opposite to what every other girls her age do.
One last thing. It's way more erotic to look at a lace panty and to see pubes behind. The implied promise is stronger, because it's a preview of what you can get if you get ride of the said panty. This while, when the pussy is shaved, what you'll get once ride of the panty is just a little more skin than what you seen when the panty was still in place.
But, once again, it also depend of the girl. If she normally just trim, or don't trim at all, suddenly discovering through the panty that she's now shaved is an invitation to a night full of kinks. She shaved because today she want to go wild, and it's one of the way she found to express it.
