unwanted print repetition python

I'm doing a simple function to print a color with an input that gives me the first letter of the word but I don't know why it prints it a lot of times.

color_letter=input("Please write the first letter of your favorite color: ")

def rainbow_color(color_letter):

if color_letter.lower()=="r":
    print("Red!")
elif color_letter.lower()=="o":
     print("That's orange!")
elif color_letter.lower()=="y":
    print("That most be yellow")
elif color_letter.lower()=="g":
    print("Green!")
elif color_letter.lower()=="b":
    print("is it blue?")
elif color_letter.lower()=="i":
    print("why would you choose indigo wirdo")
elif color_letter.lower()=="v":
    print("Aww violet")
else:
    print("wtf are you talking about")

return  rainbow_color(color_letter)

print(rainbow_color(color_letter))

This is what I get (But way too more)

Please write the first letter of your favorite color: r

Red!

Red!

Red!

Red!