The phrase "accidental relationship" is correct and usable in written English.
It can be used to describe a relationship that occurs by chance or without intention, often implying a lack of planning or forethought.
Example: "Their accidental relationship blossomed during a chance encounter at the coffee shop, leading to unexpected feelings."
Alternatives: "unintentional relationship" or "chance relationship".
"It was the accidental relationship," Mr. McAlester said.
One of the man's sons, a 7-year-old, ends up in an accidental relationship with a haughty art dealer after proposing in a chat room that they "poop back and forth, forever".
And even though I suspect that some of its more outlandish assertions are at least partly grounded in fact, Mr. Maddin is engaged less in historical inquiry than in hallucinatory autobiography, ruminating on the deep and accidental relationship between a specific place and an individual life.
10 P.M. (Sundance) MY WINNIPEG (2008) In his rumination on what A. O. Scott, writing in The New York Times, called "the deep and accidental relationship between a specific place and an individual life," Guy Maddin pays tribute to his Canadian hometown and its quirks.
Internet marketing wasn't an interest of mine, but through an accidental relationship, I learned all I could from a mentor willing to help.
"Crisis Variations," to a commissioned score by Yevgeniy Sharlat, makes room for accidental relationships between music and dance.
Another weakness is that Fair is what Paulos calls "data dredging after-the-fact torturing of dredging after-the-factal relationships andredging after-the-factons".
Hence, Schutz disagreed with Maurice Halbwachs who posited musical notation as the basis of social relationships between performers, when in fact it is merely a technical device accidental to their relationship.
Reading the book does, however, shed some more accidental light on the relationship between Ashcroft and Cameron.
And only in last year's flaccid Jack Reacher: Never Go Back has Cruise played a father this decade but even that relationship is accidental and mostly void of attachment.
Only, instead of being the planned outcome of a relationship or accidental result of an awkward, naked grapple in the loft room at a house party, it's facilitated by the internet and allows you to meet up with a complete stranger with the specific aim of making a baby – sperm donation for the Tinder generation.
