When Meisa heard that her childhood friend, Mitsuki, had found a boyfriend, she was surprised to find out that the person was a woman, but she wished Mitsuki happiness. One day, Mitsuki begged her to let her practice, saying, "I've never done anything sexual with another woman before, so I'd like you to let me practice." Meisa, who is weak to pressure, agreed to help with cunnilingus practice, saying, "On top of my clothes..." However, Mitsuki's cunnilingus became more and more extreme, and she...