Salam alaikum brothers and sisters. I have this very huge problem that I feel extremely guilty about. I invited my friend to my house and I had a small sexual lust for grabbing his butt. I did it once and claimed that it was an accident. He forgot about it. I have ZERO sexual attraction to him anymore and I really want to repent I feel extremely guilty. What should I do? Was this Zina in any way? Is their a punishment for this in life? How can I repent?
P.S: I am straight 100% now and I am 13.