Two months ago, a shocking new routine began between me and my son Noboru—we started masturbating in front of each other. In my ordinary life, with a busy husband and two sons absorbed in exam prep, one day I suddenly crossed the line with my son. We bathed together, washing each other's backs, then progressed from handjob to blowjob... and finally, in my son's room, our naked bodies became one. Is this really something a mother should be allowed to do?