He would watch anything with her if she just sat on his lap the whole time. They could just share the shower. Rather than rushing to get to the bathroom first in the morning, he would just let her have it. She would need it more after all she would be limping with his cum leaking out of her. Every day she would trot down the stairs in front of him and he would smack her pantyclad ass as it bounced, hanging out of her school skirt.
He was looking forward to life with his sister more than ever before.