[24/m] My brother (7/m) accidentally saw an inappropriate movie i own, my mom's (42/f) mad at me and i don't know what to do.

I have a decent collection of movies on dvd, my brother is always wanting to borrow my movies. A good number of which is anime. My brother wanted something to watch and found the Street Fighter Animated Movie. He watched it because he had gotten into the games recently.
I hadn't seen or thought about this movie in years. He was watching it in another room and i got to thinking, this movie had a pretty graphic shower scene. With full frontal nudity and closeups of a female character's backside. I was hoping he got bored of the movie, but he was watching it without blinking, i tried hinting that he should turn it off and i didn't want to just take the movie back. I didn't want to tell her because she's already suspicious and against me being a fan of anime, she thinks it's all pornography.
I was really worried, especially since my mom was in the same room as him. But i remembered there was a censored version with that scene cut out. I couldn't remember if my copy was the uncut version or the regular version. I hoped that it was the censored version and i also hoped that if it was uncut, then they wouldn't notice because it was a cartoon.
It wasn't. I heard my mom freak out and ask him what the hell he was watching, he immediately threw me under the bus and yelled for me to come in the room, the tv was paused on that one scene. She yelled and accused me of giving him this smut, i told him he picked it out himself and she got even more mad and asked why i even had it. She made a big stink about it being an animated movie with a woman in the nude. I tried explaining it to her but she didn't listen. She said some other stuff that rubbed me the wrong way that i don't feel like repeating
She's still mad that i let him watch it, how can i get her to see my side.
Tl;dr - Brother borrowed a movie i own, i thought nothing of it. But i remembered that movie has some fairly graphic nudity. My mom and brother saw it and my mom yelled at me. What can i do?


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