I wrote two attribute theft stories a bit ago, it just occurred to me to link here, it seemed like a popular enough fetish but very under represented.
Borrowed Genes;
http://iplank.deviantart.com/art/Bor...253A1454425203
and its sequal,
What To Give A Girl(who has everything);
http://iplank.deviantart.com/art/Wha...253A1456847824
I should note I was pretty loose on what was considered a 'trait' as she steals someones place at one point, and she eventually moves on to steal inhuman traits as well, eventually creating one sexual abomination body and one 'perfect' human body.