Titillated by comments here, I ordered three nipple toys, have been ravaging my little babies and just loving it.
Basic silicone suction cups are great. Using a bit of lube helps them to stay sealed longer. I can walk around with them, and I'm excited seeing the round lumps under my blue t-shirt while the mammary-genital-anal pleasure circuit starts to wake up. It's great to pull on them and twist them. I find myself training to have the cups on them longer, enjoying the feelings that build until I have to free my little pleasure pips.
The screw-type cups are also amazing. You tighten a kind of wingnut that draws an o-ring plunger and your nipple with it into the clear cup. In addition to the strong suction, they're great handles to pull on my nipples, sometimes hard enough that I involuntarily bend over with shock and surprise and pleasure. Heavier and longer, they have more leverage, and will wiggle much more sensately when walking, will not fit under a garment.
The third came as a bonus item, a set of four clamps on a chain with a clasp for the neck. Two are clamps for nipples and two on longer chains for reaching down to the groin. Each has a little stop screw so you can control the amount of closing, but for me the springs are light enough I can leave them at full power. The shape lets it clamp to the areola with my little pea princesses peeping out of their metal prison. Feeling the metal next to the sensitive soft compliant nubs makes me instantly mad with excitement. Very fun to play with!
I found that placing the lower clips on either side of my ball sack lifts my dick, so that slightly bending and straightening my back has the effect of masturbating my dick *very lightly*. It's not enough to make me cum but does make me twitch unpredictably with the pulling on my nipples and dick. I did try clamping to the sides of my shaft, and even the head.
With time and arousal, I find I can tolerate more pain, experiencing the energy through my pleasure circuit longer before discomfort wins out. Of course, I'm adding things in combination: ass toy, nipple toy, ballsack clamping, while suctioning my tongue into the nipple cup. I realize I've been training myself to be dominated. It's hot to fantasize submitting to weird sensations for someone else's pleasure. I would have no responsibility, completely free.