Simple pleasures

"No worries, granny, I'll be more than happy to rejuvenate you"
"Thank you my boy, if you knew how much an old lady like me want to find back her 20 years, even if it's only for 6 hours"
"I don't want to be indiscreet but... how do you expect to enjoy it?"
"Oh, you know, simple pleasures: walking, running, enjoying the sun on my skin ..."

You can guess Allan had an unpleasant surprise when, two hours later, he found his grandmother on his sofa being fucked wildly by Rémi, Allan's bully since childhood.