Wanting to try out a new idea/try out a new OC idea (gender transformation, futa, non-gender conforming, ambigous gender, etc)

So, I've recently had the idea for an OC who is an AMAB (assigned male at birth) character who is either cis-male or intersex and due to having a futa/herm as a mom, something rather straight up strange happened to them at the very end of their puberty as an adult. It seemed like despite ending puberty, that wasn't done for them as they suddenly woke up with a huge rack. As if the presence of breasts doesn't help already, they already had a very feminine build (big hips, a large behind, etc) so it was quite the strangeness when they looked at themselves in the mirror that morning.

Not to mention of having to deal with finishing high school as a senior and/or entering college, home life and friends, now their identity has been turned upside down and they're questioning if they're even the gender they we're assigned anymore. I do also like the idea of making the subject of their genetics/sex chromosomes besides the AMAB assignment very ambigious as who knows, they might be male in terms of genes or might actually have female sex chromosomes but were mistakingly assigned AMAB when they were born.