Top definition
A genre of fanfiction centered around a fictional romantic/sexual relationship between lesbian twin sisters, Tegan and Sara Quin of the band Tegan and Sara.
tsfan1: Do you think Tegan and Sara are really in love with each other?
tsfan2: I'm not sure, but quincest sure is fun to read about!
by ColyPoly July 26, 2010
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2
Sexual relations between two players on the same muggle quidditch team.
Yeah, everyone on our team is dating. Lots of quincest going on.
by Peter Porky April 06, 2014
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