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

[firecat]

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).

It's this one:
May I? (1226 words) by firecat
Chapters: 1/1
Fandom: Miss Fisher's Murder Mysteries
Rating: Teen And Up Audiences
Warnings: No Archive Warnings Apply
Relationships: Phryne Fisher/Jack Robinson
Characters: Phryne Fisher, Jack Robinson
Additional Tags: Consent, Enthusiastic Consent, Shyness, First Kiss, Holding Hands, Finger Sucking, French Kissing, Biting, Community: seasonofkink
Summary:
Detective Inspector Jack Robinson asks for what he wants. Phryne finds it very sexy.