After Minamoto no Raikou and Master managed to avoid any illicit acts while bathing together and sleeping together, the greatest trial is yet before them: they get assaulted in their dreams by Ushi Gozen.
Ushi Gozen produces a doppelganger of Master and proceeds to have sex with him. Since Ushi Gozen is herself another version of Minamoto no Raikou, what transpired before their eyes doesn’t leave the originals unaffected...