Very low key but I saw a nice ass and experienced great teamwork among strangers:
I parked my car in a big garage and had to walk a long and narrow hallway to my destination. Right in front of me was a young petite woman with super tight black yoga pants. One of those booty scrunch yoga pants, super thin. I could see her beautiful ass wiggle with every step. I kept my distance and enjoyed the view.
At an intersection some dude turned into my hallway and was now walking between me and the girl. The hallway was really narrow and the dude quite big so he blocked my view.
Now comes the party that's even better than her ass: Of course he also enjoyed the girls ass but after a few meters he realised that I probably enjoyed it earlier before he blocked my view. So he moved to the side, almost touching the wall so I could enjoy her ass again.
At the end of the hallway our ways parted. When the guy looked in my direction I gave him a nod and he smiled knowingly