twincest

== English == === Etymology === Blend of twin +‎ incest, equivalent to twin +‎ -cest. === Pronunciation === IPA(key): /ˈtwɪn.sɛst/ Rhymes: -ɪnsɛst === Noun === twincest (uncountable) (fandom slang) Incestuous sexual relations between twins, or siblings who look very similar. ==== Related terms ====