Yep.
I'm getting you in his/her's house.
There are different ways to do this.~Way One~
Follow him on his way home.
Don't let him see you.
Once he gets inside, look around.
You need to find some way to get on the roof.
Ladders, boxes or anything around his/her's house will do.
Once you get on the roof, go through a window.
You can now get his items or stalk him.~Way Two~
Once again, follow him home.
But this time, don't go through a window.
Go through the door.
Yep,
The door.
Make sure to stay out of his or her's sight.
When Senpai goes to close the door, stop it.
Then sneak your way inside.I personally prefer the first way.
There are other ways, but they are hard to explain.
These are the main ways though.Good Luck..
~Yunø