This is a different layer from switching engines, and keeping the two ideas apart will save you from muddling them. Switching engines is choosing which core motion runs. Add-ons are extra touches you lay on top of whichever engine is already running — and they're how you build that third multiplier: several things alive at once.
The menu (it's short, and you own most of it)
Your own hand coming down to your clitoris while you grind. A small vibrator or wand held there instead. A hand — yours or his — at a nipple. A flat press low on your belly, just above the pubic bone, which nudges the front wall toward the action from outside (women who've found this describe it as deepening the inside-pressure). His hands guided to where you want them. And the words, which are a channel of their own and get their own chapter.
None of this is exotic. The skill isn't the menu. It's the timing.
The one rule: one at a time
Here's the rule, and it's the whole chapter: one at a time, chosen by watching.
The temptation, once you know there are several channels, is to pile them all on at once. But piling on scatters the charge instead of building it. Think of it like seasoning a dish — add one thing, taste, then decide on the next; dump everything in at once and you can't taste anything. Dimensionality isn't noise. It's layering: you add a channel, let it land, feel it take, and only then consider the next.
Take the cleanest example to learn on: a deliberate two-channel stack — your own hand or a small toy at your clitoris while a hand works a nipple. Two clear channels, chosen, added one after the other and allowed to land — not a frantic everything-at-once. That's the whole discipline in one picture: deliberate, not piled on. (Clit-and-nipple is the safest pair to learn it on, because those two rarely fight each other for the same attention.)
Keep it serving the engine
Keep this honestly under the engine, or you'll turn a rich ride into a gadget rodeo. The add-ons serve the charge; they aren't a target of their own, and more of them is not better.
The deepest mistake here is the stimulation arms-race — the belief that the answer to a plateau is always another input. It usually isn't. The science is blunt about it: the core of the big finish is delay — holding and re-building the climb — not the sheer number of things touching you at once. Multi-point is a tool inside that, not the engine of it. So often the real answer to a plateau is a change of engine or a change of pace (the last Part's whole point), and the add-on is just one more tool reached for only when watching tells you a second channel would build rather than scatter. Bring your hand down when your body asks for it. Add the second thing when the first has landed. Layer — don't dump.
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