There's an archive at dendarii.com but I can flatly guarantee you won't find anything much suggesting that everything wasn't rosy in the garden between those two (despite the fact that they go from Strong Poison to the final chapter of Gaudy Night without passing through Have His Carcase first) judging by the - distinctly hostile - reception my HP/Vorkosiverse crossover got for suggesting something similiar ("The one where Miles is the Devil..." was one of the minor comments)