"Does this make me the Slayer? Sweet! You can be my Slayerette!" Bart stopped for a minute, looking confused, "Wait what? You're boyfriends now?" Because they'd thrown such a fit when he'd called them boyfriends before.
The mini green rage monster thing seemed totally acceptable to Bart though. After all, his girlfriend was Supergirl (at least he liked to think she was his girlfriend after one phone call and a race).
"Okay so... I'm from the 30th Century." He said, sheepishly looking towards Billy, then held out his hands like a magician performing the big reveal at the end of the show, "Ta-da!"