The alleged incident reportedly happened on Dec. 19, and police believe a second encounter occurred just over a week with a man the pair reportedly found online.
The suspects, Patrick Lachance and Valérie Vézina, were arrested Dec. 26 after the second incident in which they allegedly forcibly confined and threatened to kill the man.
An alleged victim escaped by jumping out a second-storey window.
Lachance and Vézina are currently facing charges of assault causing bodily harm, forcible confinement and conspiracy, Montreal police said.
In both incidents, victims are said to have consumed alcohol and drugs with the pair before they allegedly turned violent.
Potential victims are asked to contact Montreal police by calling 911 or by reporting to a neighbourhood police station.