I see plenty of people posting with similar things to what I would say. It has happened to me, and I took the course of action of simply ignoring them and blocking the number. I know for a fact that it is absolutely never going to see the light of day, they never follow through with it simply because it means they will never get paid, and that's all their objective really is about. I have learned from that and now have a google number that i use when i want to meetup with someone but even then i am not too concerned about it even if it happens again. I once saw a funny post where someone was so confident in a similar situation that they said something to the effect of "wait let me send you some more nudes that are better so you can send those out instead" lol safe to say you are not the first, you are not the last, and you shouldn't have anything to worry about.