Cassie

A runaway slave girl, Cassie hides in Abandoned Town, hoping that she wouldn't be found by her former master.

A new friend
After awakening in the abandoned old laboratory, Lust Doll would proceed to explore the the abandoned town on the surface, ultimately running into a lone catgirl. The catgirl would be cautious at first, but once convinced that Lust Doll means no harm, she would calm down and introduce herself as Cassie. She would also tell a direction towards the nearby inhabited city, New Ark.

Cassie is visibly hungry, so Lust Doll finds some fish for her: they knows that there's a marketplace in New Ark Slums, as well as a lake full of fishes. Cassie, as a sign of her gratitude, lets them inside her Safehouse, on condition that they would keep its location secret.

The runaway slave
When trying to enter New Ark City from the slums, Lust Doll runs into a thug extorting money from everyone passing. Not willing to pay, they easily gets rid of the guy... only to get caught by his friends on the way back, and brought to their boss.

The Don wants not just "his" money back, but also some interest, demanding 200 instead of usual 5. Lust Doll, either lacking money or not wishing to pay him, offers to do grunt job. Don sends them to bring him "his property", a runaway slave named... Cassie.

Lust Doll tries to warn Cassie about the Don, but when they go to sleep, Don's men (who covertly followed them) just abducts catgirl. Immediately realising what has happened, Lust Doll goes to the Don, who offers them their thirty pieces of silver for a job well done.

Cassie's rescue
Fortunately, Lust Doll knows where to find some help: their friend, Fawn, is a dominatrix, and Don's people are amongst her clients, so she may know something. She indeed suggests the plan, and Lust Doll goes to the local police officer, Arlene. Unfortunately, Arlene is glad to help (or, rather, has her own reason to get Don's ass), but can't: the police has agreement with the Don that while he keeps the slums under control, so their inhabitants wouldn't cause troubles, his antics would be ignored.

But not all hope is lost: if that agreement can be sabotaged, so would be Don's protection. Lust Doll gives the local hobos some money (despite one of them trying to scam Lust Doll to steal the money) so they would go past Don's toll guy and cause mayhem in New Ark. And indeed, police gets angry at the Don, and allows Arlene to arrest him.

Lust Doll manages to make it inside Don's hideout and free Cassie, while Arlene steps in and apprehends the Don, whom she then interrogates... via some secret BDSM techniques, which the Don actually likes, as he decides to become her regular "client" in The Torture Rack.

Shadows of the past
The Don mentioned that he "bought" Cassie. When asked about it, Cassie says that she was a slave; the Don bought her form the slave traders from Desert Town.

Lust Doll decides to ask the Don about it, but since his guards don't let anyone inside, they asks his dominatrix, Arlene, who just forces him to spill info on their next session. The Don also gives the map.

Tactics
Cassie's fight is pretty straightforward, as she only uses one physical attack, with no special moves or ensnaring attacks. However, she's also tougher than other enemies you could've encountered until then, so the low-player may require more than one attempt to defeat her. On the first playthrough, there's nothing you can do other than just train a bit more by fighting weaker enemies, while on new game plus she's unlikely to pose a challenge at all.

Story events

 * After dealing with the Don, Cassie is no longer afraid of visitors, so it's possible to renovate the basement, turning it into a Private Dungeon; that requires visiting Hardware R Us store and paying 10,000, then wait some time.
 * It's possible to capture a Bandit Girl and bring her home; that would introduce new character, Alissa and initiate her own questchain.

Date
Cassie wouldn't go intimate with the player before they goes on a date with her. While it's not necessary to go on a date with Cassie to progress on her story route, it's mandatory to progress on Alissa's, as the very first quest involves going intimate with Cassie as trigger condition for key events.

Lust Doll would offer Cassie to change her sloppy appearance, and, over her weak objections that "anything nice would look weird on her anyway", bring her to New Ark. At least 300 required to initiate the date. The date would consist of following steps: Once the date concludes, Cassie would unlock alternative outfit and hairstyle choices. Additionally, new scenes becomes available.
 * Visit to the Bathhouse (with slight change to Sammy's lines if she's familiar with the player).
 * Visit to the Underground Mall, to buy new outfit and change hairstyle.
 * Visit to the Roxie's Diner.

Other events

 * Cassie can be invited to visit Milk Farm. This event has several requirements, and can only be done once; afterwards, Cassie installs her own milk stash in the basement, which can be interacted with, but can't be used (it's called "private" for a reason), as well as adds the milk farm to the list of places she can randomly visit when she goes outside.

Regular scenes

 * Cassie can be invited to masturbate together or take shower together.
 * Cassie can be asked to change clothes repeatedly; the more time she's asked, the more irritated she becomes, until she says "force me"; forcing her initiates the special scene. The scene can be done once per day.
 * If The dream quests is done, a handholding scene becomes available.
 * Gifting her Cheese Slice or Your Cheese Slice triggers a funny non-lewd scene.
 * If the renovation was done, Cassie can be invited to Private Dungeon; see the page for the list of scenes.
 * If the Island was discovered and at least two more routes were done, besides Cassie's, she's amongst the possible participants of the lewd battles; see the page for details.

Random events

 * Cassie may randomly wander to the Forest Park, either to gather apples (near the apple tree) or to gather fish (near the lake); if she's not encountered there (she gives her loot when approached), she would give it on the next visit to Safehouse.
 * If she gathers apples, she randomly gives either one Golden Apple or random amount of Apples (4-6).
 * If she gathers fish, she randomly gives either Small Fishes (4-6) or Fishes (3-4).
 * If Gin and Cassie both ends up on the lakeshore (available after doing enough progress on Gin's route), a special scene can be triggered. It comes in two variants, one for Gin in his regular outfit, and one for Gin in the maid outfit (which he receives as part of his training routine); both are necessary for Gin's story progression.
 * If Cassie was previously invited to visit Milk Farm, she can occasionally visit it. If approached there, she comments on the farm's current state. She can also help with finding Bell if she wanders off.

Pregnancy
As with other characters, Cassie can't be impregnated without gifting her Fertility Pill, which is only possible after going on a date with her (as she wouldn't accept gifts until the date gets done). Her pregnancy takes some time to develop. When Cassie becomes visibly pregnant, some of her interactions changes.

After becoming visibly pregnant for the first time, Cassie reverts to her old rags, out of embarrassment. It's not possible to make her change into alternative outfits (albeit she allows to change hairstyle): she's afraid to stretch them. But, after inviting her to sleep together, it's possible to invite her on another date to buy new clothes for her, changing which clothes she uses while pregnant, and unlocking new variants for some scenes.

While Cassie is pregnant, Alissa (if presented) can make special remarks when approached.

Gifts
You may give Cassie the following items:
 * She would accept the following items:
 * Angel Milk
 * Big Fish (fully heals the player, and gives +10 exp to Resilience; only one fish may be gifted per day)
 * Chastity Belt Key (can be taken back when needed)
 * Cheese Slice (triggers special scene)
 * Devil Milk
 * Fertility Pill (can't be gifted if pregnancy is disabled)
 * Fish (only one fish may be gifted per day)
 * Fish Soup (Bad)
 * Fish Soup (Decent)
 * Fish Soup (???)
 * Fish Soup (Tasty!)
 * Small Fish (only one fish may be gifted per day)
 * Your Cheese Slice (triggers special scene)
 * Your Milk (after taking it once, Cassie temporarily becomes unresponsive)
 * The following items can be offered, but wouldn't be accepted:
 * Seaweeds
 * Weird Fish
 * Worms
 * Your Cum
 * If the whole set of bikini was collected on the Island, it can be given to Cassie, unlocking it as alternative outfit.

Outfits

 * By default, Cassie wears her old rags, and has messy haircut.
 * Cassie has few unlockable outfits:
 * Going on a date with her unlocks new dress and clean haircut.
 * Gifting her bikini unlocks it as outfit option.
 * While pregnant, Cassie reverts to her old rags; if asked about it when going to sleep, she can be invited on a special date, unlocking different clothes she would be comfortable with; it replaces her old rags when she's pregnant, albeit haircut can still be toggled at will.

Standard greetings
Default= "A new pet" quest= "Freeloader" quest= "Hypnoaddiction" quest=

Special greetings
Living Clothes= Infected= Player's pregnant= Indecent= Drunk= Hangover= During basement reconstruction= Impregnated Cassie= Late-stage, done preg date= Late stage, default=

Acceptable gifts
Angel Milk= Big Fish= Bikini= Chastity Belt Key= Devil Milk= Fish= Fertility Pill= Fish Soup= Small Fish= Your Milk=

Unacceptable gifts
Cum Extract= Default response= Seaweed= Weird Fish= Worms= Your Cum=

Island-specific quotes
Initial greeting= Compliment her bathing suit= Ask how she's doing=

Trivia

 * While all characters' routes underwent changes between Lust Doll Classic and Lust Doll Plus, Cassie's story changed the most. Not only there were different motivation for Don pursuing Cassie, and setup for going to Desert Town, but there was also the plot about Cassie's addiction (caused by her past owners), which was dropped entirely.