She didn't often go and visit her team captain at his home. Generally if she needed him for something he'd either be mysteriously 'missing', or show up wherever she happened to be looking because someone always seemed to tip him off (she wasn't sure who, but she suspected it was Captain Yamato).
Occasionally she did need to go by his place though, and she barely bothered to knock when she did. She figured if he couldn't be bothered to lock his door he obviously didn't value his privacy terribly much.
In this case, however, she really, really wished he did.
Were those gogg—nope! No she refused to look.
Instead, she quickly turned around and slammed his bedroom door behind her. "YOU'RE A NINJA, LOCK YOUR DOOR!"