Ideas on what to write about

Parabati

It's about the next generation of shadowhunters- Alex and Magnus 2 sons , jace and clary's 2-3 kids (2 girls 1boy :twins) Simon and Isabelles 2 kids.
The two oldest of jace and Alecs kids: Raphael and *u choose her name* they became parabati at a young age and when they got older they grew feelings for one another - but ur not aloud to date ur parabati so they have to deal with liking eachother but not being able to do something about it. When they turn 16-17 they aren't able to deal with it so they go against the accords and date, no one knows not even there family members and there's a legend saying if u kiss ur parabati ur mouth burns like it's on fire. In the end they end up together and are able to date even tho there parabati- u decide how the plots inbetween what I just wrote down goes. Hope u like it