[Spoiler!]
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Don't worry, Roxana can cover for herself. Cassis indeed does appear, well and alive, much to the Agriche's shock. When questioned, Roxana bluffs to her father that the Veritium's used their puppet mastery to create a doll out of Cassis's body, and that the Cassis standing before them is a doll not the real one. Ofc, her dad being an idiot of a blockhead, easily believes her.
Cassis will come to meet Roxana in private during the reconciliation meeting.
[Spoiler!]
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Not 5 days. It's actually 3 days. They were clinging to each other's body, with no clothes on, doing the deed at every second possible. Cassis has a very high sex drive, he didn't let Roxana rest and provocatively indulged her at every chance. They also really like to bite each other on the skin ♡ლ(´ڡ`ლ) She was the first to give up because she was so tired and couldn't keep up with him XD
This 3 days scene happened after a lady called Pandora, who is I guess the sister of one of the novel's original male leads. This Pandora lady had a crush on Cassis and was Roxana's love rival basically. While Pandora picked a fight with Roxana regarding Cassis, Roxana replied by saying that Cassis belongs to her. Cassis, who was walking past them overheard their conversation, and went blank when Roxana said that sentence. After that, he took Roxana by the hand and brought her to a room where they both kissed passionately, like lovers ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
Cassis told her to repeat what she said to Pandora, and Roxana said "You are mine/you belong to me" to Cassis which cuts off his last string of patience... and you know what happens next (๑•ㅂ•)و✧

hmmmm so, the pedalians are attending as well right, what if our "deceased" male lead shows up in front of jeremy and the father, isn't roxana gonna be in a tight situation like "hey why tf are you alive, weren't you eaten alive by roxy's venom butterflies?"