I think a reply of, "I would like that but let's meet there because I have plans later in the evening" and then skip out right after singing/cake....

That way it's about the birthday NOT spending time with wife AND you get to be mysterious.

Me: 35 husband:39
Sons 16 and 11 from my first marriage
Twins 5 (boy/girl)
Daughter 3
Affair bomb 2/27/14
He moved in with ow 3/13/14
OW kicked him out 6/15/14
4/2016 he seeks help for sexual addiction