OBA-015 - Summer Vacation, Mom's Swimsuit Training! The Secret Seduction in Front of Her Son

In the sweltering heat of summer, Shizuko is excited for a beach trip with her son, Masaki, while her husband is away on business. The only problem is that Masaki is terrified of the water. Determined to help him, Shizuko puts on her brand-new, revealing swimsuit and takes him for some private training. When he struggles to overcome his fear, she turns to his childhood friend and swim team member, Kunihiko, for help... What kind of tension will unfold during their risky swimming lessons?