Step-sibling/foster sibling recs?

Looking for some recs with the step-sibling trope. I really like Valerio and Lu's relationship from Elite. The only thing that bothered me was that they were blood related.

Preferably I want a mean girl fmc but I feel like this isn't really a popular trope so I don't mind either way. I normally like quieter, colder MMCs but again it doesn't really matter.

I really liked Cole and Silver from {ruthless empire by Rina Kent} I really enjoyed their dynamic. I've also already read {little stranger}

I'm fine with them growing up together or even not growing up together. I'm fine with age gap too. I'd like lots of angst and jealousy and tension please.

Some tropes I don't like: arranged marriage/marriage of convenience/forced marriage, boss/employee, pregnancy

I do like forbidden love, age gap, secret relationships.

Thank you!