I'd point out that Cluemaster was pretty much considered dead at the time, to Steph's knowledge, so it's probably not literally because she'd go after her father.
As for Damian getting sucker-punched, really I think he was just thinking he'd have an easier time beating her because of her clothing choices letting him be taken off guard, than actually being distracted by her lack of clothing.
https://archiveofourown.org/works/28588701
This is a link for a very funny fanfic about Damian, Dick and puberty, it's G, short and well written, if you like or know others like this I would love to read ☘
I always saw his and Steph's relationship as more of "Big sister and annoying little brother" type of thing, but I definitely think that page more or less confirms that he was crushing a bit on Supergirl lol
As for Rose....I could see it. Especially since she was one of the only people on the Titans that he got along with.
Emiko is the only girl we have any canon evidence to support that he had a crush on.
Kara is simply Dick's assumption and he didn't even observe the two together so that's not supported.
Djinn liked Damian but there's nothing to support that Damian felt the same.
Rose and Steph are just odd Fam crack shops that have zero bases in canon.
It's a problem that a boy and girl/ Boy and Boy can't share panel together without people reading romance into it.
I did read TT. That is not what a crush is.
Revealing his identity - Damian does that a lot. He just did that in Robin, he told the whole crowd who he is.
Having heart to heart [which was instigated by Djinn] is just being open
Closing his eyes for a kiss which she instigated is just a natural response.
A crush a brief but intense infatuation for someone, especially someone unattainable.
Djinn had a crush on Damian not the other way around.
It looks pretty mutual there, to me. Mutual enough for even Roundhouse to know to use Djinn against him. Hell even Damian's narration in that book suggested that "whatever he and Djinnn had was over" not long after that almost kiss.
Pretty sure even before that, those two had another moment that ended with them both a little flustered.