She was really in love with his new cock! He was WAY bigger than his real one, even fully erected. There was no thing anymore as premature ejaculation! She was getting as much sex as she needed now! Sometimes, when his orgasm was denied for a decent amount of time, he could even have a ruined orgasm inside his cage, when fucking her with this wonderful rubber dick. But that didn't change anything, even after he cummed in his cage, he was obliged to continue fucking her, until she gets all the orgasms she needs. After that he was allowed to lick his cum from her inner thighs.
And yes, now if she wanted to have multiple orgasms during the night - all she had to do was to fasten the rubber penis to his chastity cage. Now she could keep his tiny dick in his cage indefinitely!