Phrase used to describe the incestual fan pairing of Simon and River Tam; both characters from Firely, a short lived sci-fi series, and Serenity, the movie sequel. River is Simon's 17 year old little
sister, who became mentally and emotionally unstable after the
government experimented on her for three years. Simon, a gifted young doctor, gave up his entire fortune and future to rescue his
sister, tearing apart his family as a result. They both became goverment fugitives after River's rescue. There are debates as to whether hints of the pairing ever showed up in the show or not.
As a decision as whether or
ot Tamcest exists is up to you.
Possible, completely unbaised, scenes and quotes that fans have interpreted as Tamcest:
In a deleted scene from "Our Misses Reyolds" River asks that Sheperd Book marry her and Simon. When Simon explains that they can't marry, River is still insistant o them "mating" or "doppling" as she spews adjectives for marriage. After a lengthy argument and a swift kick in the shin (by River of course) River stuffs a
pillow up the front of her
shirt and states that they must marry because she is "in the family way."
In an interview, and I paraphrase, Summer Glau stated that, in the
future, she would "like to
play another Whedon character that was not in love with her
brother."
It is often rumoured, that Whedon stated in an interview that he had originally had a scene where River kissed Simon.
However, all of these can be made invalid if you account for River's mental instability, and that if she does like him, the end scene of
Serenity between Simon and Kaylee proves that it was unrequited.