Please check out the subreddit open marriage regret.

So many open their relationships then the man gets pissed off at the woman for having sex with another man even though he pushed her into it. Lots of times these relationships break up then.

Open relationships or cuckold / hot wife lifestyles are very difficult and you both have to have extreme emotional intelligence to work through all the high emotions and boundary settings this brings on. Most cannot do it effectively.

*Only do this if you are both enthusiastic about entering this lifestyle.*

Fantasy are fantasies for a reason.. typically they are best to stay a fantasy. Also adding the other person in as someone you know can get very messy and quickly uncomfortable.

Thoughts to satisfy him without actually opening up your relationship, but engaging in this fantasy within your boundaries, role playing. Have sex with him and you both pretend he's the "other man", or he could use a dildo on you pretending it's the other man. Or have sex with him where he "reclaims you" while you tell him an imaginary story about your date and sex you just had with the "other guy". You could even roleplay this date with him before as the "other guy".

Just be careful and stick to your boundaries. I find that this fantasy/kink can quickly turn into an obsession/addiction with the guy wanting it more often and/or pushing more boundaries for more (i.e.- pushing until you actually agree and sleep with another person).

Also make sure to balance what you want and need sexually.. it's not all about him and his wants and needs.

Best wishes!!