siscest

From sis +‎ -cest.

siscest (uncountable)

1. Synonym of sistercest
   • 2009 August 18, @picarcia, Twitter‎^[1] (post), Twitter, Inc., archived from the original on 3 September 2025:

     @004Nadleeh ooooh yes plz *v* with your sister as Luffy? Siscest ftw XDDD *hides* (lol, one is topless & one doesn't button his shirt, sexy)

   • 2015 April 28, @NekuKiryu, Twitter‎^[2] (post), Twitter, Inc., archived from the original on 3 September 2025:

     CONFESSION: ¶ I'M INTO INCEST, SISCEST, BROCEST

   • 2023 March 27, @snowysucc, Twitter‎^[3] (post), X Corp., archived from the original on 3 September 2025:

     It’s sooooo cute n sexy!!!! ¶ Love siscest and love breeding kink 🤤

   • 2023 May 29, @10BillionDreams, Twitter‎^[4] (post), X Corp., archived from the original on 3 September 2025:

     This isn't really a suggestion. I just have all these random stickers I made for what may be the only time a pair of corporate vtubers […] put on some lowkey siscest bait. There's like 30+ of these, I've had no idea what to do with them ever since.

   • 2024 November 7, @abbysarrow, X (formerly Twitter)‎^[5] (post), X Corp., archived from the original on 3 September 2025:

     yes i support siscest but i draw the line at yaoi

   • 2025 July 9, @senkaseni, X (formerly Twitter)‎^[6] (post), X Corp., archived from the original on 3 September 2025:

     when bae wont siscest roleplay with U (she probably would Im just too afraid to ask)