As none of the couples seem terribly smitten with each other, then I think that any new pairings following Casa Amour could work.
I was underwhelmed by the boys - one of them has a cute grin, and a couple of them might turn out OK, but there's definitely no-one i there who will attract ES. If ES goes no further than she has done - along the lines of 'be true to yourself and open to possibilities' then she'll avoid the trap of snakiness as that's sufficiently general (but that'll change if she's shown banging on about it again)
Danica will couple up with someone, and Tasha may well do so too, possibly Paige too? I'd be surprised if Gemma and Indiyah do.
Davide will recouple I think. It fits the story arc.
I think any of the other boys, with the exception of Luca, might do so. Luca poor chap is going to believe that Gemma stayed loyal because she's really in to him, but the real reason will be that none of the new boys seem her type at all - and I think she's be vulnerable to a post-Casa bombshell