How to Discipline a Selfish Girlfriend

Our poor MC is starting to question his life choices: yes, he has a hot girlfriend. Yes, he moved into her place and needs not to worry about rent. Unfortunately, his girlfriend is a shut-in and a video game addict, so he's not getting any. Plus, she lives with her mom and older sister.But then again, both the mom and the sister are hot, horny and willing, so it might not be all that bad.