Help Please

my little brother is being groomed...what the fuck do I do, I realized by looking through his messages that we was getting groomed on discord and I went to look through his messages more and HE LITERALLY SENT HIS DICK PIC SAYING IT WAS SOMEONE ELSES I SAW HIS TROUSERS IN THE PIC PLEASE HELP IM FREAKING OUT WHAT DO I DO I WANT TO ACTUALLY. BURN MY EYES WHATS WORSE IS I HAD A DREAM THAT SOMETHING BAD HAPPENED TO MY LITTLE BROTHER AND IT WAS TRUE WHAT THE FUCK PLEASE HELP I DONT KNOW WHAT TO DO HES ONLY 8 8 FOR FUCKS SAKE

Well so here's the thing- I've been straight all my life and i never really felt like wanting to be in a romantic relationship with females, but a few months ago when I was texting a friend (I've known her since like 5th) i kinda started to think she was really cute??? Like all her little shy mannerisms and the way we talked... and I'm super confused?? She once asked me for help on a test (we're in online classes so we text mostly) and i didn't know the topic so i literally watched a 20 min video and made notes for her so she could get a good grade. And for Halloween we had a little get together and i gave her this basket of a bunch of stuff cause i wanted to. I have a lot of sisters so i don't know if me thinking my friend is cute is similar to me thinking my little sisters are cute tho, so I'm really debating. How do I know if I really LIKE her or if I just like her as a friend? PleASE help cause I've been wondering for MONTHS .I AM CONFUSION .