My [24M] SO [23F] brother [M26] saw our intimate pictures and is furious. What next?

My SO older brother randomly checked her phone and found some of our intimate pictures together. Now, he’s furious and wants to arrange her wedding by end of this year. We haven’t even had the thought of getting married as we’re still in our early 20s and careers. He’s imposing other conditions on her as well.. not letting her out of the house and asking to up-down from her office every day. (she had an apartment close to office until now as office is a 2hour drive from her place).
What can we do here? How do we make this any better?