I speculate using my own very similar experiences having lived thru it myself having lived with two girls as a threesome I see a lot of what these two are going thru looking a lot like what I lived thru in a lot of ways actually right down to my ex getting pissed because I fucked the shit out of her girlfriend she brought into the relationship for one example
you do can actually be right about it without understanding the language as far as guessing what is going on and talking about it its not a fetish its kinda what most everyone here does btw
jealousy is a bitch he just got carried away about some new pussy I'm sure he fucked the shit out of eva when he first got with her too,i watched all their encounters and thought he fucked up when him this girl and eva were all in bed together and her and sam all but ignored eva at least that's how I saw it but I could be wrong it would not be the first time lol,edited I have been in both shoes before myself