SCOP-297 At a hot spring with her mother, a daughter sees an erection and reacts

Mako, a woman at a hot spring with her family, sees a towering erection shown off by a stranger, even with her mother nearby. She cannot talk to her mother after that, and a large amount of erotic juice leaks from her as her innocent body shifts into erotic mode. Once her mother is gone, it turns into full sex.