A request from @rottmntrulesall for their Little Sister Venus AU. I highly recommend you check their blog out!
After begging and pleading with Splinter, the Turtles and April had finally convinced him to let them take Venus for a ride in the Turtle Tank. Venus fussed only a little as Donnie strapped her into a car seat that he had made especially for her before squealing in delight as the tank roared into life. Her older siblings smiled fondly at the happy noises she made.
“You like that, Venus?” Raph asked, carefully driving through traffic. “You like riding in the Turtle Tank?”
“Yeah!” April cheered in a high pitched voice, waving both of Venus’s arms in the air and pulling a giggle out of the Indian Tent turtle.
Venus’s eyes shone happily. The buildings were moving so fast, and her chair would bump and rattle in the most fun way! This was great!
“Wait, was that—” Donnie started as he squinted out the window.
Suddenly, the Turtle tank swerved as the Foot Lieutenant, Foot Brute, and Foot Recruit landed on the hood.
“Turtles!” Foot Lieutenant rasped. “Prepare for defeat!”
“Oh, come on!” Leo groaned. “Can’t we go for one drive without some bozos ruining everything? How’re we gonna deal with these guys with Venus here?!”
“Like this!” Donnie flipped a switch, and Venus was pulled into the back of the tank and encased by a clear dome. “That bubble is made of a highly damage-resistant material that will keep Venus safe while we deal with these jerks.”
“Don’t worry, Venus,” Mikey comforted the confused baby as their siblings rushed out of the tank. “We’ll be back soon. Just sit tight!”
And like that, Venus was alone in a bubble in the Turtle Tank as the teenagers battled the Foot Clan just out of her sight. The baby chewed on her teal ribbon tail for a little while before growing bored. Venus didn’t want to be in her chair anymore. She wanted out!
A moment later, Venus felt herself slipping free of her car seat, out of the bubble, and through the Turtle Tank’s floor. Her brothers and sister were still in heavy combat though, and the baby didn’t like how loud they were being. Closing her eyes and crawling forward, Venus slipped through dimensions to get to someplace quieter until her siblings were done fighting.
“That didn’t take very long at all,” April said as she and the Turtles climbed back into the Turtle Tank.
“I guess they didn’t restock their paper from the last time we fought them,” Raph gloated, hefting himself back into the driver’s chair.
“Let me put Venus back in her spot, then we can get rolling again,” Donnie said. Flipping another switch, the protective bubble pulled away, and the car seat returned to its original position. “Ready to go, Ve-ven-oooh, boy.”
When they all saw the empty car seat, their stress levels skyrocketed, but it could’ve just been Venus messing with them. April swiped her hand through the air just to be sure. They all shared a look and started freaking out.
“Where did Venus go?!” Mikey screamed. “She’s just a baby! What’s going to happen to our sister?!”