This is exactly how I ended up fucking my own mother. Her husband cheated on her so we went to a concert and got stranded in a motel for due to bad weather After a couple of glasses of champagne she was down to just stockings and a dog collar and I'll never forget The feeling of knowing I was about to fuck her.
If I were married to you, I'd never miss an anniversary. (Having you for a wife would definitely be a cause for a celebration IMHO) I'd also encourage you to take our son to bed any time you feel like it. All I would ask in return is to hear all about it later if I wasn't actually involved myself.