My Girlfriend is WAY TOO CLOSE with my dad!!

The protagonist goes to his parents' house for Christmas vacation... When his dad sees them arrive, he can't believe his son has bagged such a fox! He intends to do everything possible to make his son's slutty girlfriend swallow his veiny cock... This game will be something like "netori," although it will have the boyfriend's perspective too! But mainly, we'll control the boyfriend's father trying to seduce his son's girlfriend!​