Is it normal to have a mmf threesome with a bi couple?...

Do whatever floats your boat. Why do you even care if it's 'normal' or 'gay' or whatever?

I've had a MMF threesome with a couple before. I wasn't sure what to expect, but I didn't have to do anything. I just laid there and they both pleasured the shit out of me.

Sucking the guy off will be very rewarding for you. Go for it. You know you want to and there is the girl too to fuck around with...this is ideal!!!

Sex is to enjoy so go for it. Once you get a good taste of cock you will love it and not be able to get enough. I have no problem sucking cock, I prefer pussy but I still like cock. Go for it!

As a bi male myself I would consider it normal. I would love to eat the woman's pussy until she cums, then do whatever she would like to see me do with her man. Hopefully she would want to watch me suck his sweaty nut sack, and cock, until he's really worked up, then she would want me on my knees and elbows while he fucks my ass from behind!
Seeing as how we are all adults, and sex is to be enjoyed, I would consider this completely normal!

I enjoy sex with my wife and other men, we do have fun. I am bi. If the other man is strate I would usualy suck him hard then we fuck my wife and I would lick up his cum when they finish. Just ask what they want from you. he may just want to watch you fuck hi wife long and hard and jackoff. you will find something fun to do.

Don't lie, you'd totally do it...just imagine you're 5 years old again and the guy is your uncle

This is all down to your feelings on the subject, I would say to go with whatever you feel comfortable with doing? If you would like to do everything you have described and experiment with the sexuality that you have then that isn't deemed as abnormal. I feel that you shouldn't feel the need to ask such things on the internet, I feel that you as an individual should be able to know and understand what you want to do and things you may or may not like. If it interests you then don't be afraid to try it, after all trying something is the way to finding out whether you like it after all.
Speaking from a guys perspective, and from my own perspective, I would choose to avoid this situation, the complications that may arise from intruding in another couples sex life aren't worth what rewards you will receive. There are pros and cons to this as with everything. As someone in a relationship (and I know I will get criticised for saying this) I can honestly say that I wouldn't want anyone else in my sex life. Now other people may disagree, but honestly aside from yourself, who can you trust? I wouldn't be comfortable with another guy having intercourse with my girlfriend, and I'm sure she would feel the same about me and another girl. I know that other couples have different fetishes and fantasies. But the way I see it is... Would you let your partner go and have sex with a person they meet in a bar or a club? I for one wouldn't.
That sent me off topic, but all I am saying is, there is no correct or incorrect answer to this question as there isn't to many questions in life, it is just a case of whether or not you as an individual feel comfortable with participating in said activities? If you know the answer to that then that is what I believe you should do.
If I am late with my comment, then I hope whatever decision you made was correct by you. If you have yet to make your decision then I hope I helped and I wish you all the best.

Go for it, I have had the pleasure of being with a bi couple and thanks to them I got to try things I thought I would never do

Just go all in

Be the best

trust me its a great experience- give him a bj and you will love the outcome (no pun intended)

XD