Happily married with lovely DH but lacking a little excitement (small kids, work, chores etc)
New guy at work started ~6 months ago. He's about my age, married himself, not bad looking but also not a head turner. We bonded straight away as similar sense of humour.
As time has gone on we talk more and more, and I think I fancy him 
He gives me cheeky looks and winks and I think he might fancy me too.
I know nothing would ever happen but AIBU to participate in this flirting now I have some feelings for him? It feels different now to before when I only thought of him as a friend. I don't want him to ask why I've stopped talking to him!!
I am moving departments soon so might not have to see him for much longer anyway.