Thinking Of Others

Recently I’ve gotten bored of my girlfriend but she loves me very much so I don’t want to break it off. Instead I’ve been secretly thinking of others while I fuck her. She has many attractive friends so I just pick one of those faces and imagine I’m pounding them instead. My girlfriend says I’ve been so much hornier and more enthusiastic lately - if only she knew the reason. I specifically only want her doggie so I can more effectively imagine others. I’m thinking to possibly send her sister a dick pic or something “by accident” and see where it goes.