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Edit:

I found this to be called: Not blood Related according to an article in TVTropes.

here are some examples:

In the anime Happy Lesson, Chitose's sisters aren't really related to him and are clearly invoking a Big Sister Instinct and Cool Big Sis.

KissXsis runs on this trope. Keita's twin step-sisters compete with each other for his affections, much to his dismay. His parents not only are aware of this, but actively encourage him to go for one of the girls, constantly reminding him that 'it's not by blood, so it's OK!'

In KissxSis, Ako and Riko literally loves their little brother Keita (related by marriage of their mother and keita's father) and they keep competing for his Love on almost every episode.

Freezing also has this, a 2nd year Pandora has to choose a 1st year limiter.. eventhough the limiter calls his pandora a sister (but not blood related) they perform an initiation "baptism" or also know as "first room visit"

Other examples: kanokon

Who started this? and what is its inspiration?

Kym NT
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    you might be surprised, but it's taken directly from real life – Hakase Mar 09 '16 at 15:04
  • Didn't find enough info for a full answer but have a look at http://tvtropes.org/pmwiki/pmwiki.php/Main/FatherIWantToMarryMyBrother if you haven't already. – Cat'r'pillar Mar 09 '16 at 17:15
  • http://tvtropes.org/pmwiki/pmwiki.php/Main/BrotherSisterIncest – giraffesyo Mar 10 '16 at 08:03
  • Not everything is a "trope"! – senshin Mar 11 '16 at 01:00
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    `I found this trope to be called: Not blood Related` **trope** `according to` **TVTropes**. So its a trope then? – Kym NT Mar 11 '16 at 07:16
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    The word "trope" has a meaning, and that meaning is not "has an article on TVTropes". – senshin Mar 14 '16 at 00:51
  • @senshin Sorry for the misunderstanding. I'm just asking if this is considered a trope or not. I guess its not and your right about `Not everything is a "trope"` gonna edit my question. – Kym NT Mar 14 '16 at 01:46

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