Use a mixer to beat the softened cream cheese until it's smooth.
Mix in the sweetened condensed milk and citrus juices until well combined.
Fill the prepared crusts with equal amounts of cheesecake filling (about 1 1/2 tbsp).
To garnish your bites, cut off the ends of the citrus to create a stable cutting surface, then use a sharp paring knife to remove the peel and white pith, cutting from top to bottom along the curve of the fruit. Once all peel is removed, cut into pieces and place on top of your bites.
The bites can be eaten immediately, but I put the pan in the refrigerator overnight so that the filling can set.
The longer you leave them in the fridge, the firmer the filling will become!