Being naughty . .......

Well what had started out as a conversation about a broken fence has descended into him wanting to fuck me. He is married, we are as close as can be..my question is what are the boundaries. I'm obviously not gonna start a thing with a neighbour (not being crass bit shitting where we live). We don't mind harmless flirting but when is too far.
It has however woke me up to I like naughty messages from couples, I'm not in to single guys, or men who claim to be in a couple. I want to talk to people who Iare as honest about their relationship as A and me!!!!!! Xxxx