I am looking for a specific fic on ao3. It involved Sam being out with this guy, just something simple, nothing serious. The fic starts where the guy is driving Sam back to wherever the Winchesters are staying. When they are parked, either the guy kisses Sam, or something else happens. Sam can kinda see Dean or someone on the front porch, or can kind of sense it (I'm a little hazy on details), but the guy insists on walking Sam up to the front door, where Dean is sitting. Dean kind of a gives a terrifying shovel talk speech that's really more just threatening the guy to stay the hell away from Sam. And Dean also had a gun. Or several. He was just super possessive and protective of Sam. Needless to say, the guy runs away, and then Sam gets kind of pissed off, and I think the fic just kind of ends there. I tagged this as wincest because I feel like I remember seeing that tag for this fic, but Sam and Dean never actually interact in a physically romantic manner. Again, this was definitely on AO3.
Thank you so much!