When we hopped out of the shower Dave and I each took a towel and taking our time slowly and deliberately teased Lizzy as we dried her off.
In return Lizzy took the lead and instructed Dave and I to alternate dry each other while telling us that we had to keep each other hard.
Dave regained control and told Lizzy to kneel and use her mouth to keep my cock hard, mouth only.
She wasn’t allowed to use her hands.
Seeing my sister on her knees sucking my cock while Dave watched was a massive turn on.
Every once in awhile he would move in for a closeup.
I think he got a thrill out of the taboo nature of what he was watching.
“Lizzy, do you like sucking your brother’s cock?”
“Ummph” was her response.
It was the only thing she could say while she had my cock down her throat and her face mashed up against my stomach.
“Enough, I don’t want him to cum to soon.
Both of you follow me.” Dave said.
He led us back to the barn and looking around spied what he wanted.
Walking over to the wall he selected an assortment of ropes.
“Lizzy, I want you on your stomach atop that table.