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
by nekokirai August 16, 2008
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.
by nekokirai August 15, 2008

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