Me and my girlfriend have been discussing maybe opening our relationship to others in the bedroom. We have an excellent sex life together we both try to cum multiple times a day with each other. We have experimented with kink a lot together and have really open and honest communication when it comes to sex.

Recently we were both masturbating watching porn together and she was playing with a really big dildo as i watched. She started to ask if I liked seeing her pussy get fucked by a big dick. Liked watching her moan and squirt on a big dick. Which I loved watching it was so sexy to see her like that and when she started talking to me drove me crazy and made me cum really quick. A couple hours later she brings back up us masturbating together and how much I enjoyed watching her enjoy herself with her toy and asked me if I wanted to watch her with the real thing no toys. I can watch or join in for a threesome, the idea of it was so sexy and loved it in a way but Immediately started getting insecure about her getting with another man. Its become a huge fantasy of mine. How can I slowly build up to watching another man have sex with her in front of me?