The main theme of the story is a romance between Numbuh 86 (Fanny) with Numbuh 362 (Rachel). The series started out as a oneshot before being expanded into a series of oneshots.
Soda at 70 Proof provides examples of:
- The Alcoholic: Rachel is fond of drinking soda, which is treated like alcohol for kids.
- Drinking Game: Rachel and Fanny play a drinking game while watching Dr. Time. Each time someone dies, they take a shot of soda.
- Drunk on Milk: The first chapter has Rachel and Fanny going down to the local bar late on Halloween to drink a few sodas.
- Gay Romantic Phase: What Rachel's mother thinks she's going through. She, herself, went through one until she met Rachel's dad.
- Oh, My Gods!: The characters use famous Kids Next Door operatives when they mutter oaths. For example, "Zero" gets used a lot. In this case it counts as an Unusual Euphemism.
- Doctor Whomage: Rachel and Fanny like the show Doctor Time and Space in the Continuums.
- Puppy Love: Neither girl is over 12 yet they're dating.
- Shout-Out: Rachel and Fanny watch the Doctor Time and Space in the Continuums Christmas Special.
- Slash Fic: Soda At 70 Proof is a Rachel/Fanny story. The main theme of the story is a romance between Fanny and Rachel.