Just let things happen....

You can suddenly feel wet hands on the opening in your boxers.
"Alli....Allison... we really shouldn't..." you open your eyes. Her baby blues are staring right up into yours. Her petite hands have found what they sought, popping your cock free of your underwear as you groan in alarm...and arousal, you admit.
"Doesn't that make it so much better, Uncle James?" she makes an approving noise as she looks down. "Bigger than Kyle's."
"I thought you said you just flashed him."
"That night, yeah... but two nights later, I went to his apartment....and... you know!" she giggles. "I fucked his brains out!"
"Allison!"
"It was alright. He didn't have a cock like this, though..." she looks down. "This is more like the black guys I watch on Pornhub."
"Allison, flattery isn't going to make me let you....mmmfff....don't...." she's stroking you now, and rubbing the tip on her stomach so that it leaves a little trail of pre-cum behind.
"I'm not lying, Uncle James. You have a nice...big...dick." She drops to her knees so quickly and smoothly that you have no time to think before your head is in her mouth.
"Geezzz....Allison...you can't..." you lean back. Fuck this is so wrong, but it feels amazing. Allison is a little redheaded slut! Who knew?
"Slrp....slurp.....sthhhhhhhhh...." Allison is lathering your tip with spit, suckling and flicking with her tongue. Where did she learn to give head like this?

You can't help yourself: you rest your hand on top of her head as she tends to your throbbing erection.
"Mmm.....damn...I shouldn't...but wow that's good..." you mumble, stroking her head as she sucks.
"Thnnkshh...." she slobbers a little as she attempts to get deeper, but only succeeds at getting halfway down your shaft. Her moth and throat are quite petite, and you feel the unfortunate pain of her teeth as they scrape your shaft.
"Ow...Alli...teeth!"
"Shorry..." she pops free... "I'm sorry, Uncle James." She kisses your shaft daintily. "It's so big."
"Stop stroking my ego, Alli...."
"Okay...I'll just stroke your cock instead." She does just that, bobbing on the head as she strokes from tip to balls. Fuck...that feels good.