My GF Won't Take Birth Control

My GF is an undergraduate and I'm a postdoc, which is how we met, she was a student in a class that I TA'ed. She moved in with me pretty quickly because we were spending most nights together anyway.

She has 2 years left and really doesn't want to get pregnant. To be honest, I would like her pregnant so we can settle down and I know she'll stay committed. But I respect her choice.

The thing is, she also doesn't want to take birth control. We used condoms for a few weeks at first but we both disliked them. Then we fucked without anything until she had a pregnancy scare, then we switched to rhythm method and I would pull out during her unsafe days.

The whole situation was majorly stressing me, to the point that sometimes I would worry even during sex, which obviously was not good for our sex life.

It's like, I want to give her a baby, she wants to continue her studies, I want to cum inside her all the time, she doesn't want to take birth control, etc., just a mess of conflicting needs.

What I settled on was getting birth control, crushing it into powder, and putting it in her food. Yeah, I do all the cooking, that's the kind of partner I am, I want her to have time for her studies and not worry about domestic responsibilities.

I've been doing this about 5 months now and it is great for both of us. I am less worried and more confident in bed, and she likes the hard, rough fucks I give her.

I don't worry at all when I nut, and we've eliminated the margin around her safe time, because she agrees we've been successful in preventing pregnancy. (Yup, more successful than she realizes!)

So, now it's down to about 5 days a month when I need to pull out. When I am really horny I shoot the first rope inside her and then pull out. No one is the wiser.

I'm looking forward to when she graduates in 2 years, I can marry her, and we can stop this pretense of preventing something we know we want in the long-term.