(Step) Brotherly Love *Phineas x Ferb*

THIS ISN'T A CRACK-FIC. THIS IS REAL IDK WHY BUT IT'S REAL

Phineas and Isabella have been dating for three years. They haven't done anything intimate and Isabella wants that to change. But Phineas isn't ready and afraid he'll do something wrong or mess up. So he says no to her. Isabella becomes jealous thinking Ferb is trying to steal her boyfriend and goes to drastic measures to make sure Phineas is hers.