Tell them to kiss each other.

You look at Shasta and Sarah on Mary's back porch as all of you float on the fumes of Sarah's weed. All gloriously naked on a warm afternoon.

"You're beautiful," you say.

They laugh.

"Are your breasts really sensitive?" you ask Shasta.

"Everything's sensitive," Shasta says.

Sarah laughs. "Everything."

"Have you ever played with each other?" you ask.

The sisters look at each other.

"Noo-oo," Shasta says.

"Yeeh-es," Sarah says.

"You liar!" Shasta says.

"You totally got off when I..." Sarah says.

"Don't say it!" Shasta says. "Okay, okay, I give."

Sarah laughs.

"How about you kiss and make up," you suggest.

Sarah grabs Shasta around the shoulders and pulls her sister closer. Sarah's shoulders roll with the pleasure of her big breasts rubbing up against Shasta's.

"Noo-oo!" Shasta protests.

"Heh heh heh," Sarah says.