How about a blowjob?
From Create Your Own Story
She puts one finger up to her juicy lips, as though she's thinking hard.
"Hmmmmmmmm. I guess that'd be alright." She smiles at you in way you didn't think Ron's innocent little sister could smile. It dawns on you that maybe the blowjob wasn't your idea after all. Before you know it, she's rolled you over onto your back. She giggles at you as she throws open your robe. Her hands feel cold as they slide your shirt up to your chest. Soon you forget all about the cold hands as her warm lips start kissing a path down from your nipples toward your naval. Then you remember her hands again as you see them stirring under her bright red hair, and then you feel your belt buckle loosening. Then the telltale "zzzziip". You feel the cool night air on your dick, and then the warm breeze of her breath, hovering close. Then your whole body radiates with warmth as her lips slide down your shaft. Your eyes cross for a minute, and then you hear her slurping. You bolt up to a sitting position as you hear Fred and George walking by outside, chatting about Chicken Chocolate.
"Shit Ginny! They'll hear!"
She just pushes you back down and starts flicking her tongue across the top of your dick.
