Responses
They never got married :) The three day smex part is still quite a long time from here, as Cassis will still have to heal Roxana from the trauma and her own poisoned body.
Further spoilers ahead
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The three days smex will happen after Roxana (1.) calls Cassis "hers" and (2.) after Roxana FINALLY confesses that she also loves Cassis.

cassis saves roxana so theyre fucking for days right? were they at some cave or something? i remember i read the spoilers long time ago