All y'all complaining* about Marten and Claire all up in each other's bidness at work?
Remember that once, Marten and Dora slunk off to fuck on the copier. Then found two far more senior staff members who had the same idea.
Point is, this is more cute than outright obnoxious. They're not passionately making out or air-humping - in fact, this is legitimately a gesture I'd see a bored Emily doing with a friend, or tolerant stranger.
The much bigger issues are Tai being present in body but not in mind, and Emily being Emily.
I think the best thing Momo could do with Emily would be to encourage her. No, wait, hear me out! Emily isn't going to stop being a zany child-woman* any time soon, but what she really just wants from Momo, I think, is some playfulness. If Momo gave in and chose how that playfulness manifested, or at least directed it into less aggravating avenues, she'd probably have a far better -- or less-worse -- time of it.
The actual solution should be for Emily to realize she's doing something wrong and to stop doing it. Unfortunately not even repeated tazerings seem to have made her realize that, so we're going with option B here.
*Unfortunately negative word that I don't mean it as a pejorative, promise.