I enrolled in a vocational school to become a sports instructor, only to find out I was the only guy there! Classroom lectures were fine, but the practical training involved getting incredibly close to girls in tight clothes that showed off every curve of their bodies! This was bad! Being pressed up against girls dressed so erotically naturally made me hard, and because we were so close, my erection was completely obvious! I thought I'd get in trouble, but the frustrated girls were actually curious and decided to "train" using my cock. Honestly, it was too erotic to even focus on the training! Even the instructor got horny, and as a result, the practical lesson turned into harem sex! I never dreamed I'd actually get to experience a harem!