I edit a Neville-centric newsletter, and out of curiosity's sake I went back over all issues from the beginning of this year to see how many Neville/Ginny and Neville/Luna fics/ficlets/drabbles there were.
Neville/Ginny - 12. However, fully half of those were either written by me or written for me, either as a response to a drabble/ficlet prompt or as a giftfic in an exchange. Take those away, and there are six N/G fics in six months.
Neville/Luna - 11, none of which were written by me. Several were written by one author, though.
Compare that to Neville/Draco, which is commonly considered a rarepair. In the past six months, there have been 30 fics/ficlets/drabbles written featuring that pairing.
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Neville/Ginny - 12. However, fully half of those were either written by me or written for me, either as a response to a drabble/ficlet prompt or as a giftfic in an exchange. Take those away, and there are six N/G fics in six months.
Neville/Luna - 11, none of which were written by me. Several were written by one author, though.
Compare that to Neville/Draco, which is commonly considered a rarepair. In the past six months, there have been 30 fics/ficlets/drabbles written featuring that pairing.