Cass and Tim become curious to the changes happening to each other's bodies during their shared puberty as twins
Cass & Tim who only start differing somewhat from each other when they reach the teenage years. Going from being practically identical to looking more like siblings. Granted, they were fraternal twins anyways. But Bruce figured the twins could share a closet, less clothes to wash. Money was zero issue for the billionaire.
Now with puberty around the corner, the two had their own separate mini collection of clothing items they refused to share with the other. Bruce was more willing to part with his credit card. Watching as the twins took inspiration from their siblings, full on copying some aspects.
Spending so much time by their lonesome, they become curious about what changes the clothes might be hiding. Not interested in patrolling yet, they wait until the rest of the brood leave alongside Bruce for the night.
Duke, their emergency contact was out cold. Alfred was away for the weekend, visiting his daughter. Thus, no one was awake or at the manor to stop them. A means to avoid explaining what they were doing. Naively believing their weird-to-begin-with family wouldn't possibly understand.
"You go first," Cass nervously insisted.
"No way, I came up with this idea. You go first," Tim shot back.
The twins had a bit of a staring contest before Cassandra finally budged. Hands swiftly finding the hem of her shirt. Lifting up & over her chest, Cass' thumbs hooked under her sports bra to fully expose her growing breasts.
"Happy?" The question made his gaze snap back up to her face. Realizing that he'd been caught staring. His twin sister had gone from flat as a board to a small A-cup in a few months. To Tim, it was quite noticeable. To Cass, it was simply another weekday.
"Time to uphold your end of the bargain." Tim wouldn't deny the disappointment he felt when she dropped her top. "Cough up."
"Ugh, fine," Tim groaned. Hands going down to unbutton his jeans, wiggling to get them up & over his hips. Easily slipping down his thighs after that. Giving Cass a good view of his half-chub. "Nah, boxers too, Timmy."
Tim reluctantly removed his boxers. The softer fabric joined the denim, looped around his ankles. Cassandra traced the length of Tim's member with her gaze. Tim shivered at the heavy energy behind the gaze. The duo was startled by the manor's front door busting open. Tim was frantic, fumbling as he put his pants back on.
"Tim? Cass?" Came Bruce's shout. Walking down the stairs, the twins acted like nothing happened.
