i was in the bathroom at grans house enjoying a wank when she burst in saying she could not hold on any longer with that she lifted her skirt pulled her tights and panties down and sat on the loo you carry on she said don't mind me there i was stroking my cock for dear life while my gran watched while having a piss i started to moan really loud as i was about to spunk the sound of her piss whistling from her pussy turnned me on gran turned to me and said go on Andrew let grandma see with that i stood in front of her told her i was about to cum with that i fired my spunk at gran the first shot was that powerful it landed on her tits the rest ended up in her panties and tights