Blindfolded
Both were unconscious, but they were not the only ones in the room. Next to the table where they were, there was a bed. On it was a woman in her forties. Her face couldn't be seen, but her clothes showed her age.
Waking up, they realized their eyes were blindfolded, and tied from arms and feet to a chair, their mouth with some cloth.
Feeling this way, Nina did not know what to do. She tried to get free, but the rope tied tightly, and the knot was impossible to untie.
When she felt more desperate because she heard moans around but did not know who or who they were. At that moment, the door opened with a 'BANG'. After that, she could hear some light footsteps. She determined that two people had entered.