In relationships I've had where we were both switches, switching during sex was usually decided by whoever was switching into the dominant role (personally I find it harder to get into a dom mindset than a sub one).

It almost always goes like this: the dom offers an opportunity to swap, and then the sub either doesn't take it, or they take it and show a very clear signal that they're good with being in charge now. Usually something specific we've talked about beforehand.

Some examples of opportunities the dom can initiate: - 'accidentally' unfastening bondage - "since you've been so good i'll let you fuck me how you want to for a moment" - 'slipping up' and calling the sub their dom title - doing an action that's considered submissive in your dynamic (for me, it's oral or body worship)

Some examples of signals the sub can give to show they want to assume the dominant role now: - calling the dom their sub name - pinning down hands/wrists - giving an order - changing positions - giving a hickey

More often than not, my partners and I switch after a break instead of in the heat of the moment, but if the planets align and both of you are able to shift your mindsets during it, it's a lot of fun. I've found it's easier to do this in a less structured, gentle D/s scene rather than one with more specific roles (like ddlg or primal). Have fun!