"You need to be careful how you act around these boys"

"You need to be careful how you act around these boys. I'm afraid you are putting yourself in some dangerous situations", John said, concerned about the way she was teasing boys.

Erin chuckled, and said "John, you are a sweetheart." She crossed her sculpted legs, and smoothed out the wrinkles of her tiny skirt.

"I'm serious, Erin. Boys at your age only think of one thing, I was their age once, you know..."

Erin batted her eyelashes, and playfully slapped him on the shoulder. Her hand rested on his shoulder, lingering, touching for what seemed like an eternity. Her touch was electrifying. "Boys my age? As if they ever stop. From what sis tells me, you are quite the horn dog yourself, my naughty little brother."

John blushed, caught off guard and somewhat hurt that Taylor would share intimate details with her family.

"Don't pout, I'm sorry", Erin said as she scrunched up her face. She dropped her hand to pat and then rest comfortably on his thigh. Her touches feeling natural and innocent, despite their sexual undertones. "My sister doesn't say much, other than your sex drive is more active than hers. That you and her have long dry spells, and..." - she stopped mid sentence, his dick had a life of its own, writhing and expanding in his pants. Her hand slid over and gave it a reassuring pat.

"My my, look who is a big boy", she cooed, "If Taylor isn't giving you what you need, then I could always help. After all, isn't that what sisters are for?"

His cock stiffened fully at the thought of fucking is wife's baby sister, but where to do it? They could just pull over, or head to the house Erin shared with her parents, or was there somewhere else?