Funtime Sarah is a minor route in Adventure High.
During it, the Protagonist has transformed Sarah into a doll and found a treasure chest containing her what looks like her clothes, but they're pink and quite revealing.
When she puts those clothes on, her whole personality changes. For better or for worse, no one can tell...
Note that if it says "Sarah" (with quotations), it's referring to the monster. Any other time, it's the normal Sarah.
As of version 0.59, there's a spinoff of this route, called Sarah's Makeover.
Note that this is just a general outline for the route. It is not a walkthrough.
Finding the Treasure
On floor eleven (11) of the dungeon, the Protagonist and Sarah finds a treasure chest. Opening it, they realize it looks like Sarah's clothes, except they're pink.
The Protagonist remarks not having any real use for it and asks why Sarah doesn't take it instead.
Sarah seems like she's about to say something but changes her mind, saying she will wear them for the Protagonist once they get back home. The Protagonist remarks that it sounds good, causing Sarah to meekly reply "Yes..."
Sarah's New Outfit
Back home, the Protagonist asks what Sarah had in mind and suggests she put it on.
She seems to hesitate again, but then puts them on while the Protagonist turns around.
A CG plays out, in which she's wearing the clothes. The clothes are heavily revealing - her pussy and breasts are both shown. Her eyes turns blank, implying that she's in mindless personality and now greets the Protagonist, saying "Hello! I am funtime Sarah!"
Confused, the Protagonist asks if she's fine, causing Sarah to ask to be played with, as she loves that. The Protagonist remarks that she should get out of the costume, causing Sarah to quickly undress. The Protagonist, worried about her, asks how she is and she says that's she's fine.
The Protagonist can then either suggest that she puts on the costume again later or that the Protagonist will hold onto it for the time being.
If the Protagonist suggests she tries on the costume later again, she gains an affection boost. If the Protagonist decides to hold onto it for the time being, Sarah gets a trust boost instead.
Wearing Them Again
Putting the clothes back on, Sarah introduces herself as "Funtime Sarah" again, causing the Protagonist to remark that they've already been over that.
Funtime Sarah then asks if the Protagonist wants to play, giving the Protagonist a choice: either take her offer, or demand an explanation.
Taking the offer
If the Protagonist decides to ignore her blatant different personality, the Protagonist has sex with her while she's wearing the costume. Sarah hurriedly asks the Protagonist to come and claim her, causing the Protagonist to say that s/he is coming.
During the scene, the Protagonist says that Sarah is his/her doll, causing Sarah to cry in pleasure and say that she is before changing back, thanking the Protagonist.
Demanding an explanation
This gives another trust boost.
Demanding to know what's going on with Sarah, she asks what the Protagonist means, saying that she's there to have fun.
The Protagonist says they'll have fun once she admits to what's going on. Sarah claims that it's her subconsious desires, but the Protagonist calls bullshit right at once, saying that it's not a repressed desire as Sarah went out of her way to ask the Protagonist to turn her into a doll.
"Sarah" then admits that it's not really Sarah saying those things - it's the dress. The dress is in reality a monster who helps humans experience their deep desires, in exchange for being human for a few minutes (or hours) at a time. The dress continues to explain that Sarah isn't hurt - rather, Sarah is feeling quite a lot of pleasure from it. It then begs the Protagonist not to put it away again, promising to be good.
The Protagonist can at that point either agree to it having more fun with her, or put away the clothes forever.
Play With Her Again
If the Protagonist agrees to the offer, s/he just tells "Sarah" to get on the bed and the two of them have sex again. Once again, the Protagonist calls "Sarah" his/her doll, causing her to cry out in pleasure and say that she is.
Put It Away For Good
This gives another trust boost.
The Protagonist refuses to accept it, saying that it's not going to be a parasite in Sarah's head. It tries to say it's a good monster, but the Protagonist orders her to strip. The monster meekly agrees, saying that it's too weak to resist the Protagonist anyway.
The Protagonist asks how Sarah is, causing her to say that she's good before the two of them split, the dress no longer able to continue giving humans pleasure.
"Sarah" Masturbating
(This requires Sarah to be level 15 or above and have demanded an explanation, then played with her again).
If the Protagonist demanded an explanation from "Sarah," the Protagonist can walk in on "Sarah" who is visibly masturbating in the living room.
Upon seeing her, "Sarah" looks shocked at the Protagonist, who demands to know what is going on.
"Sarah" claims that Sarah came over and put it on by herself. The Protagonist, as a result, asks what "Sarah" was thinking - masturbating in the Protagonist's living room? What if someone came and saw her?
"Sarah" panicked asks if other people comes, causing the Protagonist to say that Ashley lives there, so she might have seen it.
If Ashley has yet to be fixed, the Protagonist remarks that people might - it's not something "Sarah" knows for a fact if they will or not.
She apologises, saying that it felt too good to have a body so she couldn't help herself.
The Protagonist can at this point either put the clothes somewhere secure, or let it slide.
Let it slide
The Protagonist lets it slide, but tells her to get undressed and the next time it happens, to be more discreet. "Sarah" quickly agrees to this.
Put the clothes somewhere secure
(This gives a trust boost).
The Protagonist scolds the monster, saying that if the monster can't help itself, the Protagonist will have to put it somewhere safe that Sarah can't find it.
"Sarah" begs not to be put away but the Protagonist says that given how "Sarah" can't behave herself, [the Protagonist] doesn't have much of a choice, right?
"Sarah" explains that she only wants to exist, causing the Protagonist to explain that "she" will, but only when the Protagonist allows it. She quietly accepts this fate.
Enter "Dolly"
If the Protagonist puts the clothes somewhere secure, then speaks to Julia choosing either option and then heading home, after choosing to simply leave the clothes under the bed, there is a 1/10 (10%) chance that there is a scene each time the Protagonist enters the house in which the Protagonist is now wearing the doll outfit, with Sarah having had her mind completely corrupted by the monster. If the Protagonist is Dan, he is now called "Dolly". Rosa keeps her name.
If the Protagonist tries to use a gender change potion, the "Protagonist" will change her mind and the purchase is void.