IIN my wife talks to her girlfriends on the phone while we have sex?

I do that when I phone my grandmother my mother insists I call her as its my duty I don't want to because she is always moaning and lecturing me, so what I do to get my girlfriend to suck my dick at the same time, we have the phone on speaker, I am being really nice to my gran while she is moaning at me, my girlfriend can hardly suck my dick for laughing.