She knows it's a little creepy. He's old enough to be her father.

Did anyone count the rings on your vampire boyfriend? asks Xander's voice in her head.

Buffy trusts Giles more than anyone, so why not imagine him instead?

One hand guiding the vibrator between her legs, while he rubs his thumb against her mouth, giving her something to suck on while he fills her ass. She squirms, whimpering with need until he thrusts himself up, pushing the vibrator down and her world explodes with relief.

It's creepy and she'd die if he ever found out.

But it works.