Dreaming in Digital by Ltleflrt

Dreaming in Digital - Ltleflrt

An excellent well-written fanfic in which Dean repairs the android he finds discarded on a rubbish tip. Sam and Dean soon discover that sex-bot Castiel is showing sentient behaviour. Dean comes to realise that he has feelings for the quirky robot. Includes some Sabriel.

Source: http://archiveofourown.org/works/13566900