内縁 ないえん関係 かんけいでしょう
naienkankeideshō

Noun
Desu Copula
no-Adjective

Expresses probability in a polite manner ("probably…") of 内縁関係

1. Probably a common-law marriage.; Probably an extramarital affair.; Probably a relationship without legal recognition.

Polite
Presumptive
Conjecture