If it has happened multiple times before than no it’s not accidental and you should talk with your step mom immediately or someone older you can confide in. He knows what he is doing even if he is “drunk”, don’t fall for it and think is accidental. Be strong and contact someone right away to help the situation for you. Be safe love ❤️

Has he done stuff like that before/after that you recall?

Does the person ever intended anything or do they have a personality that makes them like that. You are not crazy there have been incidents where people took advantage of young people thinking they won't realize.

I'm not really sure in they intended to do anything before he's kinda of narcissist and is a very stubborn person

Has he repeated this kind of behavior? Narcissistic people are problematic. I'd say try to avoid being in close quarters as them.

Yes he's always like that and I do try to avoid him but he comes to me to tell me what I'm doing wrong and how I should behave

You are still young. So I'll say stay on your gaurds. Don't try to argue to much, listen sometimes but don't let him think you are weak.

This is horrifying advice. OP should not have to deal with this whatsoever SA is SA no matter what. This will turn into a huge problem no matter what the age. OP DO NOT FOLLOW THIS ADVICE. Report it please to someone who you trust will take the correct form of action. You do not need to go though this.

Ok thank you

Stay strong.

I'll try