I don't think I do anything special or different in my approach to the younger SBs. Except to treat them with respect. Here's an example from one M&G years ago with a very pretty 21yo that led to a sweet, multi year arrangement. We met at a tavern of her choosing, had drinks and snacks and started talking about ourselves, our lives, our wants and needs. As you do. We were sitting in a booth opposite each other, when she got up and came to my side, sat next to me real close, touching, hand on my shoulder, sharing pics on her phone. Later on, about a year into our arrangement, I asked her about that first meeting. What was it about me that made you decide I was someone worthy of your attention that you'd want to be intimate with. She said, "You treated me like a person, interested in me as a person, not just a piece of meat".
Each time I meet someone I am genuinely interested in learning about them. What makes them tick, what are they seeking, why are they here. So I listen as well as talk. I treat them with respect. That seems so basic, but it's not that common. These girls encounter lots of jerks out there!
Remember this: If a potential SB is legit, she has already decided, way before she meets you, that she is going to fuck an older man for fun and profit. That's why she's there. You don't have to talk her into it! All you have to do is be warm and charming and treat her right and she'll choose you. And you'll wind up enjoying sweet, young pussy for years to cum!