Try having your pillion hit you before you even get to a tasty bit, when they know what you will do
When you have you pillion wrapping their arms around you, it means they have less options in movement, compared to them holding the grab rails, or nothing. You will also be able to sense what they are doing on the seat, even when they are not touching you (ie, under acceleration, you can feel them move backwards - even if its only their upper body) and you can manage the throttle as required.
Get them to keep their arms around you, and instruct them to use the tank to brace themselves, when braking... this is 'speshly important for the guy riders... it can bloody hurt when someone comes slamming into the back of you
Don't forget, that if they are confident riders in their own right, you might notice them actually leaning into corners before you want them to, so be aware of how your pillion might respond to a situation (this is where the holding around you comes in, their reactions are limited).
Weighing about 95, and pillioning a mate around 125... mmm very good lesson in the effects of pillions

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