You'll get a lot of response telling you this is a bad idea, but to tell ya the truth, this would be an ideal (almost fantasy) situation for us. (I'll put on my flame suit.)
We always played with couples, usually just one over a long period of time. In my opinion, the better the relationship, the more fun two couples can have together. The people at your company should think nothing of y'all hanging out together. Couples who work together often do that. Just go to sports events, vanilla parties, the movies, picnics together. Don't be kissing in company corridors; keep your hands off each other at work, and don't be telling "special folks" about the sex part. Make sure all four of you understand the security problem and the rules needed to keep y'all's secret. If y'all feel a need to shock people, spend a weekend in a bigger city far enough away to be fairly certain y'all won't run into your grandmother.
We've always done a lot of kissing; we like it before, during and after. We once went out to dinner with a new couple, really hit it off well, and decided to sit in their van for awhile after dinner and talk. Well, talking gave way to kissing. We played with them for years, always kissed them "Hello" and "Bye" often with a lot of kissing in between. It was a special part of our friendship.
In our opinion, kissing, like sex, can be done for fun as well as for love. When I kiss Mrs. Alura it always means, "I love you." When I kiss another woman it means, "Let's get hot!" Ne'er the twain shall meet. Well, I tend to express the latter with Mrs. Alura, too.
Mr. Alura