Bubbles and the Professor by Imouto Kitten

Exhausted from having been ridden by two of his girls, the Professor 
retrieves his pants from where Buttercup left them on the living room 
floor and heads to his bedroom, planning to take a short nap to recover 
his energy.

However, a sweet, nearly angelic call of "Daddy!" drives any thought of 
rest from his mind as he enters his bedroom. After what her sisters 
pulled that day, he really shouldn't be surprised, but the sight of the 
sweetest, most innocent of his girls laying on his bed waiting for him 
still comes as a shock.

Bubbles is wearing her Harmony Bunny costume, but the white onesie has 
undergone a couple of important modifications. Firstly, the ends of the 
sleeves have been sewn together, and with how Bubbles is positioned, 
that leaves her with her hands effectively tied under her legs after her 
knees had been pushed up to her chest. The other significant alteration 
is a heart-shaped cut out over Bubble's crotch, revealing not only that 
she isn't wearing undies, but that the fluffy, fake tail, instead of 
being sewn to the seat of her onesie, is anchored by a buttplug and the 
blonde powerpuff has a carrot crammed up her cunny.

The professor stares mesmerized for a minute or two before bubbles 
comments, "Come play with your little bunny, daddy!" Licking her lips, 
she adds, "That's a yummy looking lollipop Daddy has between his legs." 
and glancing down, Utonium realizes that not only is he once again fully 
erect, but between not bothering to put his pants back on and his 
disheveled lab coat being parted in front, it's fully exposed to his 
youngest's bright, blue-eyed gaze.