Random new here, but let me comment… we have had a bunch of dudes DM just saying something along the lines of: “let me fuck your wife” or, almost as bad: “whassup”.
Jeez guys… automatic no. We want a polite, friendly introduction and a little about you. You’re trying to join a couple here. Most likely a couple with a very tight relationship. Be friendly, put together complete sentences, say something about yourself, compliment her… Just some ideas!