Bigger butt without squatting?

I have a decent sized butt and it's high but I want to make it bigger since my boobs overpower my body a bit at the moment

I can't do squats because I has a bad knee. So I've just been doing donkey kicks every second day. How many should I do to see good results in three months. I also use a step master every day for cardio and added toning

vote and comment please :)
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Bigger butt without squatting?
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