Save the Date Return address etiquette

Im tagging in to read responses. I'm in a similar situation. I already live with my fiance. My parents nor guests will care that we live together but I'm not sure what to put as our return address. If I put his last name it does sound like we are already married. My name and his name is way to long. I think the using first names is the easiest but it also sounds so informal....Do you think it would be cute to put the The Future __________ and then your address?

Example:

The Future Williams

5555 Hamilton Road

Chicago, IL 12345

I just ordered a stamp that has our first names only plus our address. We live together.

You already live together, and I'm guessing it's not a secret. So I wouldn't worry about your "conservative guests" frowning down upon you.

We did:

DH's first name & my first name

Address

C,S,Z

I agree with beauty of dreams that just our first names seems too informal. Plus the front of the two-sided post card says

Save the date

Bride's first name

&

Groom's first name

Date of wedding

so it's almost too repetitive to do it that way.

I think the most important part of the return address is for the post office. I had a few return to me for wrong addresses. I have been living with FH for over a year, so I made the labels have each first initial with corresponding last name.

M. GroomLast & K. BrideLast

Address

Address

If they've already been printed and delivered then I'd say to keep it as is, so you don't have to pay to have the return envelopes reprinted. If you do want to pay to have them re-printed, then I would just designate 1 person on the return address - either you or FH!

We don't live together but still did our first names because I haven't decided yet if I'm changing my last name. I disagree that first names are too informal because save-the-dates are, by definition, informal. I kinda understand where your parents are coming from, people will read too much into anything, but I wouldn't reprint them. If you have address labels, you could just put those over the return address. Otherwise, I wouldn't worry.

We live together, so i put our first names then our address

I am using postcards, so I had to make my return address label really small so it is just our first names. On the invites I will probably put each of our first and last names. I don't think it's too big of a deal to keep it the way it is. I doubt many will notice, and if conservative people have an issue- do you care?