(After reading the great submissions this is my first atrempt. Enjoy it I hope)
Sitting on the sofa my niece comments on how long she's known me. Her mother married my brother like 11 years ago (she was 7); I always tried to be a "good" uncle. Holidays, birthdays and such I made sure they were pleasant. She was a little "plump" when she was younger but I made sure to give her as much attention as to any one else, thankfully she grew into those pounds real well.
"Remember when I was 6, you used to tickle me until I cried uncle?" Laughing, and a little embarrassed I admitted I sure did. She was wearing jeans and a flannel shirt, a TOM BOY as ever. When she was younger she was a bit prissy and sickly, I used to say over protected, not allowed to get dirty. Eventually she enjoyed helping me with the yard work and on the cars (my brother and her mommy didn't like it either).
"Yeah you yelled uncle a lot too if I remember," sipping a beer. I had to struggle to keep my eyes off her body as we talked, remembering, as she was a cheerleader and what she'd wear to help. Although she was dressed modestly her tight body and long blonde hair made my mind race.
"Well you loved it Unc~," she laughed walking into the kitchen. Yelling for her to get me a beer while there, she surprised me to bring in two, sipping the second. "You won't tell will you?" Handing me one her knee knocked against mine teasing. I let her sip a few times in the past, always sure to limit it.
Since she wasn't expected anywhere, "Well I guess if you're good." Letting my hand playfully slap her thigh she surprised me by collapsing on my lap. Thankfully my drink was on the table, my hands were free on her. Immediately I tickled her lightly apprehensively since it's been so long. Giggling she sipped, than offered me her bottle, as my hands traced a path over her firm belly. As I took a drink her hand was on my chest, fingers trying to tickle my ribs. Grasping that hand I was able to tickle her in honest, than placing the beer on the table.
"Want to make me say uncle again?" she laughed. My reply was to grab her hips, facing her towards me. Straddling my lap hands on my shoulders, my fingers made paths up and down her ribs.
Her ribs, thighs, and belly were bait as I tickled, her giggles turned to moans and squeals. Rocking side-to-side blonde hair covering her face, trying to grab my hands. Not deterred, "Say uncle."
"Oh no!" squealing. "Got to do more than that!" Hands going to her neck, knowing her weak spot beneath her ears still she struggled, although not as hard as I'd have expected. Her shirt was open to the second button, not enough to see but enough to entice me, my hands returned to her hips as the one on her thigh rounded to her tight ass.
"Well?" as I grabbed and tickled questioning. In response she bounced a little and again tried to tickle, me. Emboldened I kneaded her ass, letting my fingers roam from her cheek to the crack and back again. This went on a few more seconds, my cock rose and I tried to push her back slightly. That was when she wrapped her arms around me.
"No you don't, I can feel it!" Her breath was on my neck as my hands froze in place, "You've had it hard before, I know. Please don't stop tickling me now!" Slowly my hand grasped her ass again as my other ran a path up her spine "Hmm..."