Believable Bondage!
Vagabondage by rivkat - SPN, wincest, first time, light bondage (obviously).
This is really really HOT. VERY HOT. With extra hotness. It starts out being about other guys for Dean, then wincest and schmoop ensues. This story is well written, and very believable. Also, even though I consider all wincest to be AUish in nature, Sam and Dean were still completely Sam and Dean in this fic, the characterisations were well written and had a lot of depth for a short-ish fic. Also, interesting premise. The beginning of the fic was very cute.