A girl has to move in with her grandfather and basically take care of him. Of course being a letcherous old pervert he repeatedly stares at her body and attempts to catch her in risque situations.
At first she is annoyed, but starts to find it sort of exciting. She even begins to purposely tease him. However she ends up building up her own frustration as well.
He starts pushing her teases further than she intended and even teases her back. Getting her so worked up he can manipulate her into doing more than she ever expected.