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** Bob and Alice get counseling to overcome their... less than healthy affection towards each other.
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** Alice and Bob regularly have threesome sex with their other triplet sibling.

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** Alice and Bob regularly have threesome sex with their other triplet sibling.(or quadruplet) sibling/s.

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* '''Exaggerated''': The story takes place in a DeliberateValuesDissonance culture that believes twins to be [[ReincarnationRomance reincarnated lovers]]. It's completely accepted--even expected--of twins to fall in love.

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* '''Exaggerated''': '''Exaggerated''':
**
The story takes place in a DeliberateValuesDissonance culture that believes twins to be [[ReincarnationRomance reincarnated lovers]]. It's completely accepted--even expected--of twins to fall in love.love.
** Alice and Bob regularly have threesome sex with their other triplet sibling.
* '''Logical Extreme'' Alice and Bob are a part of an Octuplet Harem.



** Alice and Bob are [[ReincarnationRomance reincarnated lovers]].

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** Alice and Bob are [[ReincarnationRomance reincarnated lovers]].lovers who happened to end up in the same mother's womb]].
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** Alice and Bob are [[RoyalInbreeding part of a crazy, royal/wealthy, inbred family]] and its treated like a throwaway joke.

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** Alice and Bob are [[RoyalInbreeding part of a crazy, royal/wealthy, inbred family]] and its it's treated like a throwaway joke.
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** Alice and Bob are long lost twins who were SeparatedAtBirth and [[SurpriseIncest fell in love not knowing they are related]]. [[https://en.wikipedia.org/wiki/Genetic_sexual_attraction Genetic sexual attraction]] may be involved.

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** Alice and Bob are long lost twins who were SeparatedAtBirth and [[SurpriseIncest fell in love not knowing they are related]]. [[https://en.wikipedia.org/wiki/Genetic_sexual_attraction Genetic sexual attraction]] UsefulNotes/GeneticSexualAttraction may be involved.

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** ChildhoodFriendRomance
** FirstGirlWins, and a womb companion is certainly first.

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** ChildhoodFriendRomance
** FirstGirlWins,
ChildhoodFriendRomance and a womb companion is certainly first.FirstGirlWins
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** Alice and Bob are HumanAliens whose species isn't given to major genetic diseases, and so lack an incest taboo or anything like the [[https://en.wikipedia.org/wiki/Westermarck_effect Westermarck effect]]. Due to their close bond, this behaviour is considered ''normal'' in twins of their species.

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** Alice and Bob are HumanAliens whose species isn't given to major genetic diseases, and so lack an incest taboo or anything like the [[https://en.wikipedia.org/wiki/Westermarck_effect Westermarck effect]].UsefulNotes/WestermarckEffect. Due to their close bond, this behaviour is considered ''normal'' in twins of their species.

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If they're cuddly but not together that's implied or subverted


** Alice and Bob hug and kiss a lot, but they’re just [[CuddleBug cuddlebugs]]



** Alice and Bob are HumanAliens whose species isn't given to major genetic diseases, and so lack an incest taboo or anything like the [[https://en.wikipedia.org/wiki/Westermarck_effect Westermarck effect]]. Due to their close bond, this behaviour is considered 'normal'' in twins of their species.

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** Alice and Bob are HumanAliens whose species isn't given to major genetic diseases, and so lack an incest taboo or anything like the [[https://en.wikipedia.org/wiki/Westermarck_effect Westermarck effect]]. Due to their close bond, this behaviour is considered 'normal'' ''normal'' in twins of their species.



* '''Subverted''': Alice and Bob do have some initial chemistry--but luckily Charlie appears, and the real romance between Alice and Charlie starts (a la Franchise/StarWars).

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* '''Subverted''': Alice and Bob do have some initial chemistry--but luckily Charlie appears, and the real romance between Alice and Charlie starts (a la Franchise/StarWars).''Franchise/StarWars'').



* '''Exploited''': A ClingyJealousGirl is pursuing Bob. He alerts her to the fact that his sister Alice is his twincestuous lover to creep her out so she'll leave him alone.

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* '''Exploited''': A ClingyJealousGirl is pursuing Bob. He alerts her to the fact that his sister Alice is his twincestuous incestuous lover to creep her out so she'll leave him alone.



** The twins in question are identical twins, and thereby the same sex--getting each other pregnant isn't even possible.

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** The twins in question are identical twins, and thereby of the same sex--getting each other pregnant isn't even possible.possible.
** Alice and Bob are fiercely protective of their child, and will fight anyone who suggests that being disabled means their kid's life doesn't have value.
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* '''Subverted''': Alice and Bob do have some initial chemistry--but luckily Charlie appears, and the real romance between Alice and Charlie starts (a la ''StarWars'').

to:

* '''Subverted''': Alice and Bob do have some initial chemistry--but luckily Charlie appears, and the real romance between Alice and Charlie starts (a la ''StarWars'').Franchise/StarWars).
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** Alice and Bob hug and kiss a lot, but they’re just [[CuddleBug cuddlebugs]]

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** Alice and Bob are long lost twins who were SeparatedAtBirth and [[SurpriseIncest fell in love not knowing they are related]].

to:

** Alice and Bob are long lost twins who were SeparatedAtBirth and [[SurpriseIncest fell in love not knowing they are related]]. [[https://en.wikipedia.org/wiki/Genetic_sexual_attraction Genetic sexual attraction]] may be involved.


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** Alice and Bob are HumanAliens whose species isn't given to major genetic diseases, and so lack an incest taboo or anything like the [[https://en.wikipedia.org/wiki/Westermarck_effect Westermarck effect]]. Due to their close bond, this behaviour is considered 'normal'' in twins of their species.

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**As twins, Alice and Bob are considered to be born married by their culture.



** Alice and Bob were SeparatedAtBirth and [[SurpriseIncest fell in love not knowing they are related]].

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** Alice and Bob are long lost twins who were SeparatedAtBirth and [[SurpriseIncest fell in love not knowing they are related]].

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* '''Inverted''':
** Alice and Bob hate each other, far more than simple sibling rivalry, and [[CainAndAbel are trying to kill each other]].
** Their family practices RoyalInbreeding, or they are part of a BreedingCult, and Alice and Bob are ''supposed'' to get together--but they refuse.

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* '''Inverted''':
** Alice and Bob hate each other, far more than simple sibling rivalry, and [[CainAndAbel are trying to kill each other]].
**
'''Inverted''': Their family practices RoyalInbreeding, or they are part of a BreedingCult, and BreedingCult. Alice and Bob are ''supposed'' to get together--but they refuse.



* '''Parodied''':
** Their {{Incest Yay|Shipping}} ShipperOnDeck parents play matchmaker for Alice and Bob.
** Quintuplets are in a [[{{Polyamory}} polygamous marriage]].

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* '''Parodied''':
** Their {{Incest Yay|Shipping}} ShipperOnDeck parents play matchmaker for Alice and Bob.
**
'''Parodied''': Quintuplets are in a [[{{Polyamory}} polygamous marriage]].



* '''Invoked''': A ShipperOnDeck plays TheMatchmaker for Alice and Bob.
* '''Exploited''': A ClingyJealousGirl is perusing Bob. He alerts her to the fact that his sister Alice is his twincestuous lover to creep her out so she'll leave him alone.

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* '''Invoked''': A An {{Incest Yay|Shipping}} ShipperOnDeck plays TheMatchmaker for Alice and Bob.
* '''Exploited''': A ClingyJealousGirl is perusing pursuing Bob. He alerts her to the fact that his sister Alice is his twincestuous lover to creep her out so she'll leave him alone.



** Alice and Bob have {{UST}}, and so other people keep them apart to make sure they don't get together.

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** Alice and Bob have {{UST}}, and so other people keep them apart to make sure they don't get together.become lovers.
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* '''Double Subverted ''': After it turns out Charlie is their long-lost triplet!

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* '''Double Subverted ''': After it Subverted''': It turns out Charlie is their long-lost triplet!



** Their ShipperOnDeck parents play matchmaker for Alice and Bob.

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** Their {{Incest Yay|Shipping}} ShipperOnDeck parents play matchmaker for Alice and Bob.

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** Alice and Bob are [[ReincarnationRomance reincarnated lovers]].



* '''Double Subverted ''': After Charlie is killed off, Alice and Bob start having subtext again, and stronger than ever…

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* '''Double Subverted ''': After it turns out Charlie is killed off, Alice and Bob start having subtext again, and stronger than ever…their long-lost triplet!

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* '''Exploited''': A ClingyJealousGirl is perusing Bob. He alerts her to the fact that his sister Alice is her twincestuous lover to creep her out so she'll leave him alone.

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* '''Exploited''': A ClingyJealousGirl is perusing Bob. He alerts her to the fact that his sister Alice is her his twincestuous lover to creep her out so she'll leave him alone.



** It isn't ''impossible'' for Alice and Bob to have healthy children, merely meaning they have to be more careful to prevent their negative recessive genes from becoming expressed. Or they adopt children.

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** Alice and Bob adopt a child.
** It isn't ''impossible'' for Alice and Bob to have healthy biological children, merely meaning they have to be more careful to prevent their negative recessive genes from becoming expressed. Or they adopt children.expressed.



** Bob and Alice run away and [[StartingANewLife start a new life]] under fake identities, and pretend they're just LookalikeLovers.

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** To escape scrutiny, Bob and Alice run away and [[StartingANewLife start a new life]] under fake identities, and pretend they're just LookalikeLovers.

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** Alice was the very first girl Bob ever met, and FirstGirlWins.

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** Alice was the very first girl Bob ever met, FirstGirlWins, and FirstGirlWins.a womb companion is certainly first.



* '''Zig Zagged''': Alice and Bob are twins caught in endless WillTheyOrWontThey.

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* '''Zig Zagged''': '''Zig-Zagged''': Alice and Bob are twins caught in endless WillTheyOrWontThey.



** Alice and Bob have {{UST}}, and so other people keep them apart to make sure they don't get togther

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** Alice and Bob have {{UST}}, and so other people keep them apart to make sure they don't get togthertogether.



** It isn't ''impossible'' for Alice and Bob to have healthy children, merely meaning they have to be more careful to prevent their negative recessive genes from becoming expressed. Or they adopt children.



** It isn't ''impossible'' for Alice and Bob to have healthy children, merely meaning they have to be more careful to prevent their negative recessive genes from becoming expressed.

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** Alice was the very first girl Bob ever met,
and FirstGirlWins

to:

** Alice was the very first girl Bob ever met,
met, and FirstGirlWinsFirstGirlWins.

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