My dad told me I should fuck both of you.

Dad and Son are in the living room when dad feet's get cold. "Get my slippers from upstairs" He says.

While upstairs he sees two of his sisters friends so he goes up to both of them, "My Dad told me to come up here and fuck both of you".

"You're lying" they retort.

Okay, I'll prove it then, "Dad, did you say both of them?"

"what's the point of fucking one".