I think given they are in there together with no one else; at least for the foreseable, there is a very small chance things may develop.
1: We have to remember that to go any further may impact their friendship in the longterm.
2: Leora is savvy and knows that if they go slow, 'we' will all be watching, waiting and talking, thus building the moment to fever pitch. And even if it goes no furtehr, she got our interest.
I get a sense that they both could well be 'up' for some G on G fun. There are some subtle movements and gestures - especially from Malia. But the female is a strange creature to our male minds and perhaps they are just enjoying the intimacy of seclusion and it may well go no further than to lubricate their imaginations for personal playtime.