This is a great one to start with, I will usually ask my couple to lead to or away from me. When asking them to lead to a specific location at the shoot I want to use it allows them to get more comfortable without noticing the camera constantly aimed on them.
Another prompt that works for both partners, I ask one of them to lean in and whisper sweet nothings in their partners ear. If I'm not getting the reaction I want, I will say something like, oh man I shouldn't be able to hear what you are saying..
or Com'on make it dirtier.
I use this prompt for natural laugh and smile. Work for both partners when I want a candid reaction.
You can use this prompt to run to you or away from you.
run in place if the area you are shooting is limited.