My son-in-law is flerting with me

My daughter has been married about a year, I am a widow of two years my son-in-law flirts with me openly I took it as fun only that's all I thought it was I enjoyed it and flirted back a bit, the last time he visited me I was seeing out when he said Carol that's me daughter, wont take it up her arse are you interested, I was flummoxed as to what to say, I can only think he knew I was into anal sex, before she was married we openly talked about sex I told her what was expected of her, different positions blow jobs and some men expect anal, she asked me out right if I had taken it up my bottom, I had to tell her I had for years, I remember her saying she didn't think she could I told her it didn't matter what they did as long they enjoyed, so what to about my son-in-law I am not getting any mail attention I am tempted I am in between two fires, could I face my daughter if I did, he has text me several times saying how about it?