FNS-244 · Couldn't Resist My Plain Junior OL's Huge Ass: Back Piston Fucking Mia Kouki

I can't stop thinking about the massive ass of my junior OL, Mia Kouki, who is plain and quiet but hardworking. I'm always captivated by her wearing an overly defenseless short tight skirt while working. Whether she notices me staring or not, she always smiles. One day, after missing the last train at a company drinking party, I end up staying over at her place, and I finally can't hold back my desire for her huge ass...