My Dad told me to fuck both of you...

My Dad told me to fuck both of you...

A dad and his son are in the living room when, when the dad's feet get cold.

"Get my slippers from upstairs". Asked the dad.

While upstairs, the son sees two of his sister's friends, so he goes up to both of them.

"My Dad told me to come up here and fuck both of you". He said.

"You're lying!" They bellowed.

"OK, I will prove it. Dad, did you say both of them?" Asked the son.

"What's the point of fucking one?" Replied the dad.