He begs you not to hurt her.

'Don't hurt her, please' he says.

'I won't', you reply, desperately trying to think of a way out.

'Lie on the bed, face down, eyes closed and with your hands behind your back'. You watch as he slowly obeys.

With one hand on his wife you carefully move beside him.
'I'm going to tie you so I can relax' you say. He remains silent.

5 minutes later they are both tied and you are wondering what the hell to do.
'So what now' he asks, mirroring your thoughts. 'We won't tell anyone, just go.' but you know they will once the shock wears off. So you come up with a plan.

'right, what are your names'?
'Chris and Janet' comes the reply.
'OK, Chris, here's the plan. I leave you unhurt and I steal nothing, but I take something that lets me be certain that you will never tell anyone I was here! I take photographs of the pair of youhaving a nice, dirty sex session.'

'No way' he replies, but you just look at him.
'Think about the options Chris', he does and then he says 'OK.'

'Right, Chris, I will release one of you, the one I release strips off, services the other, and then cums themself, clear?'.
'Yes.'
'OK, who do I release, you or Janet' you ask him. YOu hear Janet making loud muffled protests but look at Chris, waiting to hear his reply.