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The original was posted on /r/AmItheAsshole by /u/Libby9835 on 2023-06-29 23:26:46+00:00.
I (20F) have a little sister Sophie (16F) Sophie is my half sister, we share the same mom but our dads are different, when I was around two years old my mom started dating Mike (41M at the moment) and have been together ever since, I get along with Mike and we really like each other, I would consider him a second father.
Last week I heard Sophie speaking with my mom and Mike and tell them she would like to start birth control, she knows that she can get the implant and she would like to have it, Sophie has a boyfriend (16M) and have been together for around a year so we all know why she made the request. Here's the thing my mom was ok with taking Sophie to the doctor and get her the implant but Mike freaked out and grounded her, she can't go out with her friends, she can't have her phone, and there's no way she can hang out with her boyfriend for the moment, now, when I was 16 myself I got the implant and have had it ever since, tbh if it wasn't for it I'd probably have a kid at the moment, I know birth control is super important, my mom knows too since she had me pretty young.
A couple days ago I approached Sophie and told her that what she was feeling was normal and basically told her to just be careful, etc etc, the whole talk and I gave her a box of condoms, I also explained to her how to use them properly, I mean, I know for a fact this girl is already having sexual relationships with her long term boyfriend, I would like her to be safe at least, that same day I took her to the doctor and we both got tested just to be sure (medically you should get tested every six months, that's what doctors recommend) and afterwards we went out to eat, it was a nice bonding moment with her and i feel we both got closer, I like that she can trust me, I know I didn't have someone I could trust like she trusts me and that lead me to make many mistakes that could have been avoided.
Well yesterday Mike went through Sophie's room and he found the condoms, he started screaming and yelling asking her where she got them, I told him that I had given them to her, Mike is furious with me because he says that I overstepped, that Sophie is his kid and he makes the decisions in her life not me, that I'm only her sister and I have no right to do this sort of stuff. My mom while she agrees Mike is being overprotective agrees with him that I overstepped and that I should not get involved in these sort of situations.
Aita?
Tl,Dr: My little sister (16F) is starting to be sexually active, I gave her the talk and condoms and got her tested, my step father found out and is mad at me.
Edit: Grammar