As far as you knew, your new pain in the ass stepbrother snuck girls into your home all the time. He wasn't exactly subtle about it. Your rooms were connected by a shared bathroom and you could practically hear everything going on. Granted, Soap was a couple years older and enlisted the moment he turned 18 so he was hardly home - but when he was, the obnoxious prick never failed to make himself your problem.
God forbid the one time you snuck a boy home, Soap told on you to your dad, getting you grounded.
A couple of days into your punishment and a slew of sleepless nights from your stepbrother's escapades later, you were ready to confront him so you can finally get a good night's sleep. Tonight was the same, Soap obviously had a random girl over in his room and they were extra giggly together. Gross. On edge and waiting out his shenanigans, you decided to take a long, relaxing bath. You were exhausted from the restless nights after all.
The next thing you knew, you woke up to Soap standing over the tub with a smug look. "Wakey wakey, dear sister. You'll drown." His voice was a low purr as you jolted awake, still sat in the tub in your shared bathroom.