I'm starting to see parallels between this and the non-relationship Sam and Dean had in "What Was and What Can Never Be" - they've found something and lost something.

Re: Amelia - I'd have rathered she was Jimmy Novak's ex but I guess SPN minds don't think the way mine does.

Re: Limes - I have a collection of golden age plup stories "the Adventures of Jules deGrandin" - an "occult detective" in the age of the charleston and purple prose. In one tale he mentions that lime juice controls or repulses the Rakshasha ('member them?) Maybe drinking lime juice is keeping her human.