Man, that is so fucking hot !
I love the thought of your wife being hand fed both your cum. What would be even hotter would be if you both shot your hot loads directly in the sluts mouth.
You could even invite more friends over and all take turns to fuck her then one by one have each guy cum in her mouth, or have them wear condoms, fuck her ass and pussy, blow their loads then empty each condom in her mouth and watch her swallow each load, lick the condoms clean, then her lips and then say thank you to each guy.
You can also have them all cum in her mouth at the same time, fill the sluts mouth till it runs out and then watch her gulp it down like a good cum slut.
That would be the perfect slut wife.