She is bored and so it comes as no surprise that she has just found a pile of handcuffs and footcuffs. So she makes herself comfortable and chains herself up with relish. Of course she takes off almost all her clothes beforehand, otherwise you won't feel anything.
The stupid thing is that the handcuffs belong to her neighbour who is not enthusiastic about what she is doing. Because his wife can always come back from shopping, although there is still a little time left ;-) So he annoys her a little bit and chains her lying on her stomach neatly to the hogtie. Of course, the ball gag must not be forgotten.
Finally, he locks her up in the basement so his wife won't know.