How do I become more dom for my sister?

u/SunflowerFingering23

Hey! F24 here in need of some help!

Me and my sister (F30, I'll call her 'Angela' going forward) have been dating for the past 8 months. It's been great overall, she's been so kind and nice to me and I've never been happier in all my life! We even are planning to get an apartment together soon so we can start fully living with each other, so it's been amazing so far.

However, an issue we're constantly having is with sex. It's not that we aren't having it, we have it all the time and it's amazing, but rather the issue is that Angela is really submissive and even kind of a masochist. It's a total contrast to how brash and aggressive she can be at other times and its a contrast I love about her.

Anyway though back to the main point, the issue there is that I have no real experience with being dominant or aggressive like that in sex, and I can tell its leaving Angela feeling a bit unsatisfied whenever we're done fucking. So I want to learn how to become more dominant and aggressive to make her happy, but everything I'm finding online is kinda pricy and hard to understand, so I was hoping you guys could give me some advice on how to do so clearly and without breaking the bank!