Chastity and orgasm denial discussion

A few of us might recall Sarah Jameson and her book “Be Careful What You Wish For.” She described giving John, her husband, a milking via perineum massage, whether he was locked up or not. I always found this seemed improbable, but it has occurred to me twice lately. I shave my perineum to keep the skin smooth, which helps prevent soreness from the ring when I wear my MM device. Consequently, the area becomes quite sensitive (I assume women understand what that feels like). While giving oral to my wife with my lock on as usual, I make sure the skin is well-lubricated so it doesn’t catch on the ring again. My wife teased me by massaging this spot, and recently a few quick strokes have triggered an ejaculation-like release without the full sensation of orgasm. She was slightly annoyed about it and mentioned she’ll steer clear of that area next time. I know the perineum is connected to the prostate, but for me, this new effect is surprising. With the heightened sensitivity from shaving combined with long-term denial, I believe my underused penis has been supplanted by the perineum as my primary erogenous zone! Has anyone else experienced something similar?