28 [M4F] LA/Online - Tips for being someone else's first time?

There's this person who I've been talking for a month or so and she seems pretty kinky and into exhibitionism and public stuff, but she's virgin. We have plans to meet in person next week at a mall, get some coffee, and if we both feel like it (very likely), we're thinking of going to the bathrooms together and play for a while. We're also going to a park and do more innocent stuff later. Thing is, we're both pretty open sexually, and the way things are going and by the chats we've had, I think it's a reasonable assumption that we're gonna end up having penetrative sex at some point in the future and, likely, I'll be her first time.

Now, I've been called a considerate lover before, but I still would like to ask for tips or suggestions or anything I, and we, should consider. Don't hold back, even if you think it's obvious! Just because it's obvious doesn't mean I couldn't have missed it, and that would be the worst kind of thing to miss.

Things we've already considered: We're gonna get tested for STIs. She's looking into a contraceptive method that she feels comfortable with, and we're probably gonna be using condoms too. I'm experienced enough to know not to do anything I'm not comfortable with, and so far she seems like she knows that pretty well too, but still, I'll be making sure that anything we do, we both want to do it.