On the subject of bondage/kink and gay sexual expression, it seems to me the nature of sexual expression doesn't really seem to move from one thing to gay to bi to pansexual or something where all that's changing is the genders or types of exact people involved.
Like there is kind of a steadfastly just gay sort of person like Dumbledore, who it seems the author has stated desires to sexually express himself with other men, but it seems likely to conclude it never went so far as to include roleplay or power exchange or games or whatever, let alone bondage.
Like it's like there are plenty of kind of roleplay dominance games, or just games generally, that a group of commited adults might experience or indulge in like one of them masturbating to their preferred significant partner while pretending they are actually Nathan Fillion and while the third observes observes the other two as like a slight exhibitionist thing or something, and if the first person/he/she reaches orgasm then their significant partner promises not to wear any underwear the next day or, like something, and this can be all men or all women doing this or perhaps a mix of one kind or another.
Or maybe these people just want to have one person dress up as a maid with makeup or something even though they're a guy and the girl dresses up like a cop and they have some kind of reverse gender/androgyny roleplay or something or other, where there are themes of authority and power but it's not necessarily bondage or something, or, maybe they're both guys or both girls.
Ok sorry that might of been a bit graphic, but yes to make the point, there frequently is a kind of gay sexual expression, but then the qualities don't seem to be particularly focused on just same sex intimacy they start to branch out in other ways that aren't easily categorizable or fall into the lion's share of currently existing categories.
Once you get to Cassandra with the sort of straining towards the KISA kind of gay expression but still possibly straight at times sort of thing, but not just a streaky sort of gray Dorian type, things get pretty different. Cassandra would probably kiss and fondle her same sex Inquisitor partner (know that's not canonically possible but.. yeah) in a steadfast non-explorative sort of way, but she also might go past that into some other things, while also not going into things past that point, and which can be sort of random elements in between hard bondage and discipline and simple same sex intimacy, like I was saying, random games.
In general, if that aforementioned group of people or perhaps just a pair of those people are into actually literally physically tying each other up (or just always one over the other) or bondage they are in a much smaller subset of the category of that hypotehtical aforementioned group of people generally into roleplay of power and dominance games generally, and who are often a subset of the category of just general adults expressing themselves in a gay sexual manner. Anyway, there can be a theme of power, but it can have varying degrees of expression or it takes different forms.
Anyway, just saying there are small and subtle variations to be wary of in the... bigger picture, so as to the poster stated bondage is going too far but other areas might still be relevant and not necessarily correct to go wheeling all the way back to just focus on same sex sexual intimacy, there lots and lots of people who fall in between those two points.