The Muffin Guide

Update v0.3: Muffins affect all genders

MUFFINS
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Muffins are the primary focus. Their magic is based on upon four ranks: Bronze, Silver, Gold, and the really hard to obtain [for users] Platinum. The magic of a single muffin also works in fourths, which will be listed with the total in its rank.

Baby Blueberry: Makes a diaper appear on the victim and renders them incontinent. Additional muffins increase diaper thickness.
B: 4" [1" per fourth]
S: 8" [2" per fourth]
G: 1' [3" per fourth]
P: 2' [6" per fourth]

Chocolate Cuteness: Regresses the victim. Works only once unless a higher rank is consumed.
B: 1/2 original age [-1/8 per fourth]
S: 1/4 original age [-3/16 per fourth]
G: 1/8 original age [-7/32 per fourth]
P: 1/16 original age [-15/64 per fourth]

Delightful Dark [Chocolate]: Age progresses victim. Works once unless higher rank is consumed. Magic doesn't work in fourths.
B: x1.25 original age
S: x1.5 original age
G: x1.75 original age
P: x2 original age

Grand Grape: Makes victim grow larger. Also makes them immune to the vacuum effect of space.
B: 4" [1"/fourth]
S: 8" [2"/fourth]
You get the idea.

Hearty Hazelnut: This muffin is a very special case. Usually, this muffin can be eaten to heal most injuries, and can even be shared with multiple people. However, if one person eats one half and another person [or almost anything humanoid] eats the other half, they will fall in love, regardless of gender or species...so, yes, you could pair someone with Gardevoir or Lilligant if you wanted to.

Marvelous Melon: Increases breast size.
B: 2 cups [0.5 cups/fourth]
S: 4 cups [1 cup/fourth]
G: 6 cups [1.5 cups/fourth]
P: 12 cups [3 cups/fourth]

Nursing Nectarine: This muffin will make the victim produce milk. Best to be eaten with Marvelous Melon. If Gallon Production Rate not less than or equal to cups added by MM [Ex: 2gal/hr = Original Bust Size + 2], the victim's breasts will slowly and painfully swell.
Additional muffins will increase GPR. Nursing Nectarines do not operate in fourths [x/4]
B: 1gal/hr
S: 2gal/hr
G: 3gal/hr
P: 6gal/hr

Powerful Pear: Increases butt/hip size.
B: 2 sizes [0.5/fourth]
S: 4 sizes [1/fourth]
Etc.

Sweet Strawberry: Shrinks victim. Also increases durability, allowing them to withstand almost anything.
B: -4" [-1"/fourth]
S: -8" [-2"/fourth]
G: -1' [-3"/fourth]
P: -2' [-6"/fourth]

Viewtiful Vanilla: Increases breasts, butt, and hips. Expansion magic is twice as powerful.
B: 4 cups/sizes [1/fourth]
S: 8 [2/fourth]
G: 12 [3/fourth]
P: 24 [6/fourth]
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ICING
Icing is something special. It has its own magic and can even make the insanity even more crazy!

Violet: Makes the effects of the muffin it was placed on spread through touch.
Red: The effects of the muffin it was placed on will occur if the victim gets angry. Effect rank is determined by the highest rank of the aforementioned muffin the person has ever eaten before the icing muffin. The iced muffin does count, however. [Example: Lily eats Bronze Marvelous Melon with red icing. Her breasts expand two cups every time she gets mad.]
Green: Doubles effects of most muffins [Chocolate ones not counted]
Blue: Turns any males who eat a muffin with this on into a girl and vice versa