The Best Friends (to Lovers) Bargain

Sam drags his thumb across my cheek, triggering a meltdown across the surface of my skin. 
I’m not exactly sure what’s happening to me, only that it reminds of having a low-grade fever and riding a rollercoaster, all rolled into one. 
But I’m not sick. I might be completely inexperienced, but I know what this feeling is. 
It’s longing
AKA lust.
I’m lusting after my best friend, and I have a feeling nothing is ever going to be the same between us again…