Submission-1○ New wife trained by brother-in-law/Future (submission name) Future-san knew she had M desires but couldn't confess them to anyone, so she got married as is. She intended to keep this secret hidden forever, but it was accidentally found out by her husband's brother. Moreover, the brother-in-law has an S fetish and had always felt strongly attracted to Future-san. It didn't take much time for the two who shared this secret to enter into an SM relationship.
