My wife wanted to mark territory here at home because of my sister-in-law

Every time my sister-in-law comes to spend a few days here at home it's the same thing. My wife gets all jealous of the intimacy I have with her and begins to imagine that I'm going to change her for a brand new one, so she always makes a point of marking territory and several times during the same day she falls with her mouth on my cock sucking me until I empty my entire sack and so I don't even feel like eating my sister-in-law.