Not sure how to feel...

Ok ladies I'm looking for some advice. I am currently 5 weeks PP. Since having to wait for so long my husband has resorted to watching porn for pleasure which isn't a problem it has never bothered me before. The problem is tonight we both decided we wanted to try getting intimate for the first time since my cesarean. It was great except that it seems my husband has taken a liking to cuckholding and threesomes. We both enjoy role playing to help bring new spice to the bedroom but I'm am not sure how to feel about any of this. It made me feel very uncomfortable when he kept saying "I fantasize about watching another man with you, what would you do if while you were giving me a blow job another man joined in?" so on and so forth. I want to fulfill his fantasies but this particular one I am not ok with.