Grease two 9x4 or 9x5-inch loaf pans or pullman loaf pans. If desired, line pans with parchment paper to allow for easy bread removal. Set aside.
Working with milk dough first. Punch down risen dough. Transfer to clean work surface. Divide dough into 8 equal parts. (Use a kitchen scale for ease and accuracy.) Roll each part into a ball. Cover dough with plastic wrap as you work to prevent dough from drying out or forming a skin.
Next, work with milk chocolate dough. Punch down risen dough. Transfer to clean work surface. Divide dough into 8 equal parts. Roll each part into a ball. Cover dough with plastic wrap as you work to prevent dough from drying out or forming a skin.
Grab one milk dough ball. Flatten or roll out dough to a length of about 8-inches and width of 5-inches. Grab milk chocolate ball and repeat rolling to same measurements. Place milk chocolate dough over milk dough. Starting at the shorter end, roll dough together into a log.
Place log seam side down on work surface. Use a small rolling pin to flatten and roll log into a rectangle about 5-inches wide and 7-inches long. Starting at the shorter end, roll dough into a log. Place log seam side down into prepared loaf pan. Repeat process until each pan has a total of four logs.
Cover the two loaf pans with plastic wrap. Allow dough to rise until doubled in volume, about 40 minutes.