Further on

after my last post nothing happened, my son and daughter in law went away on holiday and moved in there new house about 8 months ago, about 5 weeks ago I was at there house do some DIY when I finished we was having a drink and she mentioned about what happened and that she did enjoy what she did, and then explained why she did, her cousin in Leicester was having an affair with her father in law and how amazing the sex was, and when she was grinding her pussy against my arse she had an orgasm which felt amazing and that's why she was showing me her pussy, and thanked me for not taking advantage of it,

then Sunday they was round my house where I noticed she had a g string on, she kept bending over so I could see her arse crack so this time I let her see I had a big hard on now I don't know what to do, l look at my son and think I can't do it then I look at her and want that pussy.

just don't know what to do