Wife wanking me whilst on phone to her mum

So last night my wife and were lying on the bed and she was gladly sucking on my nipples as she gave me a wank. She loves toying with me edging me along fast slow stop smack my balls play with my head. SO the phone rings my wife reaches round picks up the phone and its her mum who if you read my stories you know i fantasize over a lot.
So i thought that was it my wife who occasionally can be really dirty letting me lick her arse sitting on my face giving me a bj. I thought i would have to wait so lying there she then turns to look at me carries on talking to her mum and starts wanking me off again whilst talking to her mum. OBviously she doesnt know how much i fancy her 77byear old mum and knowing she was talking to her daughter as she wanked me off really turned me on.

I soon felt the urge and with an on purpose loud groan i shot my spunk all over my wifes hand.tO which my mil asked if i was ok lol. Her daughter told her i was fine lol.
They finished there conversation my wife put down the phone and turned to me and said "you came quick then did it turn you on me talking to my mum" and laughed at which i laughed back.iF only she knew