AO3 advice request - chapter 2 of fic has different rating than chapter 1

I wrote a short "Teen" rated fic and submitted it to a kink community. I now have a second chapter of the fic that's "Mature" shading into "Explicit." Should I post it as:

• part 2 of a series?
  
• chapter 2 of the same work?
  
• a separate fic, incorporating a copy of the original chapter?

I don't think the kink community would care either way; I'm thinking about readers who might want to have just the less explicit fic (or, heck, the more explicit one).
( link to fic under cut )