Need Advice

So my boyfriend told me something last night that i have t been able to fully process yet. He told me he wants to watch me have sex with a different guy that has a huge dick. In his words like 10-11 inches and thick. I’m not sure what to do yet. Honestly the whole situation made me nervous and I just started laughing out loud because that’s what I do when I get too nervous.

I don’t want to disappoint my bf, but I also worry what will happen from this. Please help.!