Icebook

Icebook is the femslash ship between Ice Cube and Book in the Battle for Dream Island fandom.

Battle for Dream Island Again
Book and Ice Cube, along with Spongy, fall into the Evil Forest while riding on Puffball. Book and Ice Cube run away from Evil Leafy together, and says that "We fell into a forest, and Evil Leafy chased us out. Spongy was with us, but Evil Leafy captured him!" when Golf Ball says the two should've been in Yoyleland.

Book and Ice Cube both express interest in being part of Pencil's alliance, to which she accepts them both in as "alternates". The two are disappointed, but accept and become part of her alliance.

Book and Ice Cube are going to Match's dance party, when Pin tries to stop them, saying that "Match is a real meanie!". Book responds with "I've already made up my mind. We're going!". Pin accuses her of "making decisions for Ice Cube without letting her think for herself", saying "I think Ice Cube would love to swing to come swing with me, but YOU have to control her every move!". Book denies this, as she says "What? That's nonsense! Ice Cube is my friend, I would never-". She's cut off by Pin claiming she's "suppressing Ice Cube's rights", as she begins to accuse her of being a controlling friend, and being "filthy, self-absorbed, unloving", before being cut off by Ice Cube tell her that she does want to go to Match's dance party with Book.

When the two get to Match's dance party, Book asks Ice Cube if the dance party is exciting. Match kicks the two out because the party was only for alliance members, and the two were alternates.

Book and Ice Cube, along with the other alliance members, do not agree to stay on Golf Ball's team, with Ice Cube saying "Yeah!" in response to Book saying "Neither do we!" (referring to her and Ice Cube).

The two sit next to each other in the Freesmart van.

Book and Ice Cube are both characters you can play as in BFDIA 5b. When Book meets Ice Cube, she asks if she's okay, to which she responds with a simple yes. When Book asks Ice Cube why she's in Lego Brick's dungeon, she replies that she doesn't remember. Ice Cube tells Book that she could escape the dungeon if she had arms, and Book says "Well, you're in luck! I have arms!". The two escape the dungeon.

Book is upset when Match uses Ice Cube to put out the flame on her head, but doesn't say anything.

In the next episode, Book recovers Ice Cube after Match recovers Pencil. The two continue to sit next to each other in the Freesmart Supervan.

Book tells Ice Cube that they're at the summit of Yoyle Mountain, assuming they had won the challenge, to which Ice Cube responds with "Yay!".

When Freesmart and W.O.A.H Bunch are fighting, Book says that W.O.A.H Bunch, "literally glued the worst headphones ever onto our dear friend Icy!", before hugging her. Ice Cube agrees, saying "Yeah!". Later, when Ice Cube uses her headphones to play a lullaby, Book calls it "the most soothing lullaby I've ever heard!", claiming it almost puts her in a trance before falling asleep.

Island Dream for Battle/IDFB
When Ice Cube attempts to sacrifices herself to put out Woody while he was burning, Book tells her that she can't, saying it's "too dangerous!". Afterwards, when Ice Cube ignored Book and went on with it, Book claims that her action was "selfless".

Battle For BFDI
The two both leave Pencil's team, believing that it was becoming unhealthy for them. They join Gaty's team together. During the challenge, when they were running through the world's largest oven, Book watched sadly as Ice Cube melted, warning Taco that "Ice Cube's starting to melt under the intense summer heat!".

When Ice Cube returns to her team after being freed from the jawbreaker, Book immediately hugs her, saying that her team had missed her. Later, when Book notices that Ice Cube "looks nervous", she asks if something's wrong, saying that if anything bad happens she can tell her.

After Book finished explaining how Taco had abandoned their team, both her and Ice Cube looked upset. Book hugs Ice Cube for comfort.

Four, interrupted by Bracelety, supposedly says that "Ice Cube" was the next one safe, to which Book says that he must've been confused, because Ice Cube was on Team BLEH, and their team was not the one at Cake at Stake.

Upon feeling that her, and Ice Cube, had been mistreated by Team BLEH, she speaks for both her and Ice Cube saying that they wanted to see things change in the team. After Ice Cube tells her to let her think for herself, Book looks guilty and asks Ice Cube what she wants. When Ice Cube tells her that she wants to switch teams, she tells her that it's not BFDIA anymore, and she "can't just do that". After being interrupted by Coiny, Book notices that Ice Cube is gone, and she calls out her name. When Book is talking with Gaty, she reminds her that her and Ice Cube joined team BLEH because they felt like they were being mistreated during their time on Freesmart.

While talking to Pin, Book tells her that she wanted to protect Ice Cube from the negative behavior that came from Match and Freesmart; she's almost driven to tears thinking about the fact that Team BLEH had become a team that Ice Cube no longer wanted to be on due to the behavior that she believed was "protecting" her. When the lava nearly kills her (and Taco), Book saves both of them, sacrificing herself in the process.

After Ice Cube received her happy thought, which was Pencil, Match, Leafy, and Book being set on fire while she watched, Book was also happy, saying "Hawwh!!! She's so happy!".

Fanon
The ship is not very popular in the fandom, likely due to their conflict in BFB and Book's "controlling" nature over Ice Cube. Another contributing factor to the ships lack of popularity is the fact that the two of them are on different teams on TPOT, with their interactions ending with the two of them seemingly on bad terms (mostly on Ice Cube's side). The pairing is overshadowed by more popular Book and Ice Cube ships, like Booklow, Tacobook and Icelety.

Fandom
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Trivia

 * Book's official character guide bio says "Book and Ice Cube have formed what Book believes is an inseparable bond, as Book always protects Ice Cube."
 * Book and Ice Cube could be seen standing together in the background of episodes before their first actual interaction in BFDIA 2.