More specifically, friends with benefits to see what it could turn into...
Here's the situation in a nutshell: Things are going pretty late-night-bootycall-esque where the boy says he has feelings for the girl, but both have established they're not looking for a serious relationship but are willing to keep meeting up for late night hookups and see what happens. During these, they act all couple-y and are both having fun and get along, but during the days, there is no contact between the two of them at all.
This seems like a hopeless situation, right? Because it can't build towards a relationship if they start with sex, yeah?
And if it matter, these two people met each other because they hooked up with each other's friends first.
I personally think it's not going to work, but I don't know how to tell my friend because she doesn't think she's going to get hurt...and it seems like she 99% indeed will be hurt by this.