After Raikou absorbed Shuten's body fluid Her lower body grew a more robust stick than Shuten.
Then Raikou controls her stick and inserts it into SHTEN. SHTEN sent out a lewd wail. Because she had been absorbed most of her energy by Raikou before, she could no longer maintain her strongest shape, and her body changed back to the previous girl's shape In this state, she can't bear the stimulation of Raikou She was already weak and forced to erect. Now Shuten is Raikou's toy.