Girlfriend Worried

When my girlfriend pulls me off and has sex with me, we talk about our fantasies. I always tell her how I would love to have sex with the woman across the road. She gets off on it and we both climax. She told me how this is her number one fantasy. One day, the mom from across the road came over to see my mom, but my mom wasn't there. I asked her to stay and we ended up back in my room with me on top of her and her legs in the air. While doing that, my girlfriend came through my house and caught me in the act. She stormed off. We talked about it for a while and she finally came around to the idea. We ended up having threesome with me taking turns with them. I really want to make this a weekly thing, but my girlfriend is worried?

— Brian, 23