Handcuffed and blindfolded. What awaits Nora?

Nora's boyfriend has a horny evening planned. Nora knows nothing about it. He undresses her, cuffs her and puts a blindfold on her. She is a little nervous. What is he planning. Surely not something with 2 men or something? She has never done anything like that before although they have often fantasized about it together. Would today be the day? He puts her on a mattress in the room and starts playing with her while her hands are tied behind her back. She can't move. And then the bell rings. Panic strikes. She wants to get dressed but can't free herself. A second male voice in the room. And then she decides to completely surrender and enjoy herself.