Line a pan with parchment paper, making sure to leave some overhang. Set aside.
Place the red candy melts in a microwave-safe bowl and heat on 50% power, in the microwave, for 2-3 minutes or until smooth when stirred. Stop every 15-30 seconds to stir during the melting process to ensure the candy melts don’t overcook.
Follow step one for the pink candy melts, keeping the two colors separated in different bowls.
Remove the lid and foil film from the frosting container.
Set aside ½ a teaspoon of the frosting before heating, if you will be using the heart or any other type of sprinkles.
Heat the remaining frosting in the can in the microwave for 45 seconds to 1 minute, or until fully melted and smooth.
Add the extract to the frosting and stir well.
Pour half of the frosting into the bowl with the melted red candy melts and the other half into the bowl with the melted pink candy melts.
Stir each color vigorously until fully mixed.
Alternate pouring the two colors in random spots into the prepared pan, pausing to tap the pan in between so it evens out and removes bubbles.
Once all of the chocolate mixtures have been poured into the pan and evened out, sprinkle the top of the fudge with as many Valentine-themed non-pareils as you like.
Place the fudge in the fridge to chill for 2 hours or until it has solidified.
If desired, use the frosting that had been set aside and place a dab on the back of a heart sprinkle, and press it into the middle of each fudge square you cut later additional decoration.