Simple spanking

Wally patted his lap. Buffy begrudgingly lay across it as he hiked down her shorts and began to lay smacks across her ass.

Once her ass was beet red, Wally let up. Then he had a fun idea.

"Joyce, you aren't Buffy's mother, your her twin sister. Buffy, Joyce isn't your mom, but your twin sister."

He would change Joyce back to normal, but he wanted to have fun with this change in role for a bit.