A couple is forced to cum by a beautiful lewd woman using both swords in a mixed bath hot spring where she thought there was no one there and forced cuckold threesome

When a couple came to a mixed bathing hot spring, they unexpectedly encountered a beautiful lewd woman using both swords!? She was a little confused when her butt touched by the encounter, but couldn't say anything. After that, as they were in a mixed bathing hot spring together, the woman from before comes and the two of them come and use their techniques to make them unable to say anything and end up cuckolding them both!? What will happen to the couple who are both cheated on, both their bodies and their minds...