Peter had.... His own way to express love, he'd usually snuck in your bedroom by the window

This night your little sister had entered your room and found him...... She was holding a broom.....

The sound of the broom pounding on Peter's head mixed with Peter's little OW! woke you up and you saw the scene and ended up chuckling

Later, Peter came back and layed with you in bed, putting his head on your stomach while you were sitting up on your bed, giving him head pats after you had patched his head with some bandages

Peter: "your little sister is cruel!"