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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
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Related Words
A name that describes someone who is smart and loving towards others. Always gets A's in every subject. Siyoon is a person who makes people laugh with his bad jokes. He can also be described as a midget who everyone loves.
person - "siyoon is so smart"
siyoon by Torieh3 January 18, 2017
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
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
Yasis you’re such a sisonke!
sisonke by Prawn king November 23, 2021
The mightiest of all, pimp master,
ex. Sasoon pimps you
sasoon by Sasoon October 30, 2003