Sharing some mental play that has worked well for my wife and I & I think other's might enjoy.

My girlfriend is a self proclaimed cum slut and enjoys my cum anywhere in or on her. So everytime I am with her I give her at least one load.

One part of the dynamic between my wife and I is that I always come home from my dates 'empty' with no cum left for my wife.

Additionally, I use condoms with my wife and will only occasionally give her the cum she so desperately wants.

Recently I've introduced the idea that my cum belongs to my girlfriend and I'll make my wife explicitly beg for my girlfriend's cum. Lastly, when I do give her cum she also must thank my girlfriend for allowing her to have it. She finds all of this very humiliating, in a good way.

Curious if anyone has done this or some variation of it, I'd love to build on this dynamic.