undercover relationship

it can happen when A.there is a long distance relationship happening or B.two people meet on the internet; in an undercover relationship is when out in public you appear to be single, but as soon as you or your partner are at home either one of you are in "relationship mode". when two people are in a undercover relationship they can date whom ever they was but no matter what they both will be loyal to each other. Note:went both are at home you act like your dating (with out actually "going out")