I got caught spying on my sister in the shower and I feel extremely bad for it. How may I ask forgiveness?

Anonymous
Before I proceed, let me just clarify that I do not have any sexual or romantic thoughts towards my sister. Just the thought of even holding her hand is enough to make me cringe. I just so happened that there was this one time wherein I accidentally caught a glimpse of my sister's breasts (she wears slightly loose and revealing clothes at home) and, I dunno, ever since then I couldn't get it out of my head. I had this urge of really wanting to see them again and I believe this is what probably caused me to spy on her. When I got caught, my sister actually didn't call me out on it. I just felt so bad about it and confronted her about it first and told her what I was doing. She was very frustrated and emotionally distraught and understandably so. So please, how may I make it up to her? I swear this behavior will never happen again. I feel extremely disgusted in myself. I really don't know how I managed to do this. If any of you plan to post a reply saying how I'm sick and a disgusting pervert, please, don't bother. I am already aware of how horrendous my actions were and I feel that I may never forgive myself for it. I am genuinely asking for your help.
I got caught spying on my sister in the shower and I feel extremely bad for it. How may I ask forgiveness?
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