Siscon 

A person with an unusually strong and probably sexual attachment to their sister. One of the numerous Japanese "complex" portmanteaus that indicate real-life creeps and fictional doujinshi protagonists.

Siscon as seen in "Rabu Rabu Eien <3"
Ani: Natsuko, I... I've always been watching you...
Imouto: Oh Oniichan! I love you too! Let's have sex!

Siscon as seen in Real Life
Ani: Natsuko, I... I've always been watching you...
Imouto: Get away

Siscon by nekokirai October 14, 2008

siscon 

A siscon is someone who enjoys fictional (typically anime) depictions of incest involving sisters. Can be sister x brother or sister x sister but not brother x brother (that would be brocon)

The word siscon can also be used to describe a fictional character who is in love with or very obsessed with their sister.

“My favorite ships are siscon ships”

“lol (insert character name) is such a siscon”

siscon by chaoticmeows January 6, 2022

Siscon 

A person with an unusually strong and probably sexual attachment to their sister. One of the numerous Japanese "complex" portmanteaus that indicate real-life creeps and fictional doujinshi protagonists.

Siscon as seen in "Rabu Rabu Eien <3"
Ani: Natsuko, I... I've always been watching you...
Imouto: Oh Oniichan! I love you too! Let's have sex!

Siscon as seen in Real Life
Ani: Natsuko, I... I've always been watching you...
Imouto: Takeshi, you need help.

Siscon by nekokirai October 10, 2008

sisconism 

Sisconism, dervied from siscon with the suffix -ism, means you have a consanguinamorous attraction towards your sister.

the way he stares at his sister makes me suspect he's oriented towards sisconism

sisconism by Bobbystrurrew June 13, 2023

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SISCON PHARMA by SISCON PHARMA. MFG. (P) LTD. February 6, 2010