And yet, I couldn't work up the courage to say no. To say, 'Sorry, Amy, but I think we should stop,' or 'What would Susanne and Carl think about this?' or even just 'no thanks, you've done enough for me'. But it wasn't just a lack of courage that stopped me. A part of me needed to see how this played out, to know for sure if Amy was making a move or if it was all in my head.

And so, I complied. With my mother-in-law standing inches away, I undid my jeans and pulled them off, leaving me with just boxers on. I faced towards her once again,...