FERA-122 Near-incest sex with my mother, only the tip goes in

"Absolutely no insertion!" Ruie (Ayagawa Ruie), pinned down by her son, desperately resisted, refusing only the penetration. But her son, in a state of excitement, wouldn't listen, pleading, "Just the tip is fine!" Overpowered by her son, who had grown into a full adult, Ruie realized she couldn't escape and reluctantly agreed, "Really just the tip," accepting it. However, another problem arose as their other son, Akira, witnessed the scene. His mother's lewd appearance caused him to become intensely aroused...