I'd lick that sexy ass too! There's something so hot about providing oral stimulation to my wife while she's fucking someone else, knowing that I'm just intensifying the pleasure she's getting from this other man's cock and making her cum harder around it. When I can, I also like licking the shaft and balls of the cock that's fucking her, knowing that it's going to cause him to shoot a bigger load of extramarital cum deep into the woman I love.