It's a standard stage hypnotist trick: The subject wakes up, feeling alert, still not sure about this hypnosis stuff. "OK, now count to 10 on your fingers." But it's hard to do that, when you've forgotten the existence of the number 6.
That's a key moment, when the new subject first feels lost and puzzled, suddenly suspecting that the hypnotist really can take over mental control. The hypnotist restores the number, the subject is relieved, then the hypnotist plunges them deep into trance again, with some confidence that any natural resistance to hypnotic suggestion will have been weakened.
Messing with your sub's memory... something not to be done lightly ... turns out to be one of the subtler and yet more powerful effects you can have. Personally, e and I usually play with just recent, fairly irrelevant memories, to be safe. But after you've altered, removed, restored and even constructed your sub's history a few times, she'll come to think of you as being in charge of such fundamental things as "did that really happen" and "is that really the time?"
* In one of our very first sessions, I removed the number 6, with the usual results. e was puzzled, but not all that impressed. She never liked numbers that much anyway. Then... I removed her middle name. That got her attention.
* In another post, she's written about her intense need to pee every even-numbered hour, precisely on the hour. One time, when she'd just returned from doing so, I told her to forget the preceding five minutes. Suddenly it was just one minute to the hour... and her bladder was bursting again, the urge to go unstoppable. After nearly a minute of this torture, I restored her memory of those five minutes, and the urge evaporated again with the return to standard time.
* One morning, as part of a relaxation exercise, she slipped a large candle into her bottom. She was happily humping it when I abruptly removed 10 minutes of memory. She stopped dead... went very quiet... and in a pale voice asked, "uhhhh, how did that get there?"
* "Sometime today you will get your long, flexible dildo, put one end in your ass and the other end in your pussy, and fuck both holes at the same time. You will then forget about this entirely, until I tell you to remember." She giggled when the memory flooded back, a few hours later.
* Memory wipes are a convenient tool for maintaining consent rules. We've negotiated some fairly edgy scenes, then I've removed her memory of the discussion, so when it occurs it's a complete surprise to her.
* When she carries out some humiliating public act, like the time she removed her bra and panties in the mall food court and set them on the table beside her, I usually remove her memory of it, and then restore it a few days or hours later, so she can relive the fresh, delicious shame all over again.
* I'm proudest of the memories that I've completely invented for her. I guess the idea of installing apparently permanent thoughts in a person's brain appeals to me. You have to be reasonable with these. I told her that she'd bought a Corona at a particular store one night, but she just got a sudden quizzical look, and said, "Huh, that makes no sense." Turns out she knew that store didn't sell Coronas. I've had better luck since then, installing memories that she absorbs with no comment, but refers to weeks later in passing.
I'm sure we'll mention other memory-bending examples in other posts, so you can see how we mix it in with other effects.
Meanwhile, whenever something outrageous occurs now, she almost immediately asks me, meekly, "Did that really happen?" She's losing the ability to tell for sure, when I'm involved. She comes to me for her reality checks. Sometimes you just have to trust people.