ROYD-247 A two-day, one-night lovey-dovey creampie sex session with a secretly lewd, plain-looking g

During the holidays, I invited some girls over for a drink at home! As the King's Game begins and the excitement builds, one very plain girl joins in! And the final command is to live together with the plain girl for two days and one night!? I thought it would be too awkward... but the plain girl didn't refuse! Furthermore, when the King's Game begins with just the two of them, I discovered that she had hidden big breasts...!?