There are times in life when the moment is just right for something to happen, and a surprise relationship is one of them things that can occur. Two people might have come on vacation to the same spot, but they were more interested in just relaxing than meeting someone special. It might be a surprise relationship that results from their weekend getaway, but their future will be up in the air as they part ways.
The relationship they form might be only a temporary one that is not meant for more than just a mutual intimacy over a few days, but they could decide they want more. This works well only if they live close in their normal lives, and it can be difficult if they are far apart when they leave. One person might want to continue the relationship only to find the other is not interested. The variations can be complex and disturbing when the two have to face their real life again.