"I'm Cassie – I live with Cheryl and Brian." I know." He smiled at her and she felt weak. "I'm Zak, short for Zachary. Never call me Zachary unless ...you're angry with me." He smiled more broadly and she knew she wanted him. It bordered on compulsion."Zak," she repeated when she got her breath, "I like it."She had fallen in love, and despite misgivings she could not resist. He obviously fancied her as well, and they made a date for the following week. Within two weeks they were in bed together.. Her breasts were probably a B cup and looked like a nice generous handful. They were perfect. I think my mouth dropped open slightly as I stared at my sisters tits."Josh! What the hell?" she said.I replied, "I thought it'd only be fair if I got to see you."She just stood there shocked for a moment, then her mouth slowly cracked into a small grin."I guess you're right." Her hands dropped to her side, revealing her crotch to me. My eyes moved down from her perfect tits, across her perfect flat. Now she was saying "that’s it Ronnie, make a baby in your moms mouth, mommy needs you to do it in her mouth" Mom made some sort of whining noise at that but never tried to pull away. I started squirting off while looking at Aunt Shellies bare ass. Aunt Shellie was humping her pussy up against moms face while I was squirting off in moms mouth.I finished first, when I was done emptying my balls into my mothers mouth I stepped back. Aunt Shellie however kept her hands on moms head. She was lifting. He said that his wife would kill him.Over the following weeks, I attempted several times to test the waters and discover her sexual side. I started by playing porn on my laptop with her to see what she may be into but she immediately wanted me to fuck her and to turn off the video. I attempted to get permission to photograph her during sex but she immediately shot that down due to fear of it being posted online. I requested her to send me nude or sexy photos of herself in lingerie but she.