Get a blowjob

"Beth, could you come over here and get on your knees?" You ask politely. Your sister smiles at you - that's a rare sight, mostly she was just apathetic - and gets on her knees, stroking her hair out the way. "Alright, now I want you to suck my dick."

Unzipping your trousers and pulling down your boxers, your sister gives your already half-hard cock a few strokes and smiles. "Sounds good, bro."

She takes you into her mouth, sucking gently - she wasn't very experienced. She'd only had one or two boyfriends, and was probably a total virgin. Not like your slut of an older sister - god, Jessica was only 21 and must have slept around with like 10 different guys by now. At least she'd know what she'd be doing when you got around to her. Moaning, you wrap your fingers through your little sister's hair and nudge her further down your length encouragingly.

"That's good, Beth..." You moan. Your sister smiles around your cock - you can feel her lips twist- and picks up pace. Soon, you feel your balls swelling up.