You are now a 2D girl however you have a lecherous Oniichan. How do you handle him?
Report him to the police if he keeps it up.
Unless it's Kaiki. If my oniichan is Kaiki he can have his way with me anyday.
Try (not) to avoid him tripping onto me basically every other minute.
get myself into compromising situations
Blood related or not? Regardless I wouldn't put much of an effort since imouto almost never win.