Disclaimer: I don't own the Simpsons. Never have and never will
Bart knocked on Lisa's door gently.
"Come in," Lisa said.
Gently he pushed the door in. He went over and put an arm around his little sister.
"Hey Lisa," he said, "I heard you had a bad day today?"
She nodded as a few tears came down her face. He brushed away the tears with his thumb.
"Look Leese," he said, "I know what you're going through. I've had those days many times before. I know it makes you feel like you're going to scream but as much as this sucks you WILL feel better soon. I had felt exactly how you're feeling now and it's not anything that stays that way."
"Really Bart?"
"Really," he said giving her a big hug.
"Why are you being so nice to me," Lisa sniffled, "I thought you hated me"
"Leese you're my little sister," Bart said, "I couldn't hate you if I wanted to and believe me there were some times I wanted to."
"Do you... do you love me," Lisa asked.
"Duh," Bart said, "You know it man"
"Hey," Lisa laughed, "I'm not a man."
"No but you are feeling better," he said tickling her.
"Well... maybe a little," she admitted.
"Told ya," he said