A teenage tsundere little sister who loves her big brother shows off her panties. "You've been looking at Mako's panties, haven't you?" Mako gets a full erection when he sees her panties while defenseless! She's angry, but she keeps showing him her panties as if to tease him. He can't help but insert his penis into her panties as he looks at them up close! Even though she says no to it, her sensitive pussy accepts it. Enjoy Mako Iga's first little sister & seduction work!