What the fuck do i need a condom for?

She has a kid with you and she's still worried about STDs? Sounds like there are some trust issues in your relationship...

Also, id never marry someone who insisted on a condom for oral. That's just fucking stupid.

Thats kind of on her, its pointless to suck rubber

Using a condom for oral sex within a committed relationship seems extremely over cautious.

She is sperm-a-phobic. Wash your cock really well and promise her you won't ejaculate in her mouth.

Why would you wear a condom during a blowjob?
Do you have strongly acidic semen?
Are you an alien, from the film series, alien?

Sounds Like She Either Has Something She Doesn't Wanna Give You Or She Has Some Type Of Phobia? Another Possibility Maybe She Doesn't Like The Taste Of Cum! Some Girls Don't So They Insist On Either Not Giving Blowjobs Or Make The Guy Wear A Rubber

Maybe she's got something she doesn't want to give to you.

I believe you had to think about her side of the story. I know your girlfriend (soon to be your wife) are living very happily and you have a beautiful child, you're the perfect couple and joyful family. And both are loyal to each other as well, so 'trust' issues may not be the case. And no risks of STI or STD. But...
What about her preferences?
Let's admit it. Cum is kinda gross. It has a not so pleasant smell or taste. And the fact that it comes from the same hole you piss from does not make it any better. Don't get me wrong, she loves you, but... She may find that kind of DIRECT interaction, too dirty or too gross. Imagine if you were in this position like, I dunno rimming or licking near the anus with no proper cleanness. If this is the case, you should talk about these hygyene issues or germ phobia and try to find a solution. Offer her to have a shower together, you can get sneaky and get aroused while bathing. But remembering to be very cautious to clean your penis.

Now if this isn't the concern, maybe it has something to do with her. From my own experience, there was a time I thought I had herpes and did not want to give a bj to my boyfriend so it couldn't spread. But luckily it was just severe acne and did overcome it. Either way you have to talk with her to get to know what the problem is. Please, try to be comprehensive with her and let her explain it, rather to attack and just say 'why not?' But 'how you feel about this?'

And finally if nothing else works... Maybe there is no specific reason.. Maybe it's just up to her not feeling comfortable or confident with this because she just believes on it. Just like some people hate spiders, they don't know why, but people hate them. Even if they are 100 times bigger than a spider and can easily get rid of it and even if they know it's completely harmless. They just feel it. And that's OK. We all have our own beliefs, preferences, likes and dislikes. Think about all the good things you both enjoy, think about sex not about just pleasure or lust, but to feel comfortable about it. To feel like you can relax and enjoy yourself with your loved one. You can even get to an agreement about trying oral sex with no protection just one day or use those extra-thin sensitive condomns as a starter.
Any way, talk to her. Be oprn and Respect her decision, don't push her to do something she won't like and could affect negatively all what you have build now. Remember that sex is about being both comfortable and enjoy yourselves at a lovely experience. Good luck!

Maybe I could suck you off.

So what happens if you go down on her? Does she insist on using one of those rubber things that cover her pussy?

God my cock is hard thinking about it watching you come all over inside her pussy

Dude just tell her I'm not wearing a rubber anymore I'm going to cum inside you and you're going to eat my cum! Yeah tell me after I just put that thought in your head that your cocks not getting hard! Okay i bet its hard as a fucking rock right now!! I don't have mine is hard thinking about it right now

You were the one that bought nuttella flavoured condoms.

Sex stops after you have kids, you dirty man.

You see... there are these microscopic things (you can only see them with a microscope) called deceases (some can make you sick, others stay with you for life, and some can actually kill you)... and they are transmitted through sexual intercourse... WE CALL THEM STDs (Sexually Transmitted Deceases).

THEN there are these other things called bacteria which cause infections (cause extreme pain to your urinary tract system, and gastro-intestine system - and are especially dangerous to females)... and they are also transmitted through sexual intercourse... WE CALL THEM STIs (Sexually Transmitted Infections).

The STDs and STIs are very sneaky, because you don't know they are there while you're having sex... and you can have them without even knowing it... and some of them lie dormant (inactive) for a long time, and years later you find out when you start having symptoms. THIS is why the fuck you need a condom!

CONDOMS prevent STDs AND STIs from being transmitted between sexual partners... YES, Even Oral sex (Gastro-intestinal system - remember)... plus with some STDs and STIs, WARTS can form on your genitals, and lips and tongue (for her and you). DO YOU Really want to have to go to the clinic to have genital Warts frozen off your private areas? OR have to explain to people (friends, family, co-workers, strangers shopping at the store) why you and your girlfriend have WARTs around your mouths?

Not having the protection of a condom can put your health and life, and someone else's health and life, at risk. SO DON'T BE A FOOL AND PUT YOURSELF AND YOUR GIRLFRIEND AT RISK. USE A CONDOM DUMBASS.