I admit I pretty much have the first fetish, at least in a consensual way.

(After all my current story has it twice...)
I know Airwreck's "Stud" also has it in a consensual manner.
But I know what you mean about trying to find it in the particular flavor I prefer with searches. Came to the point where I decided if I wanted to see it, I'd have to write it.
As far as male dommed forced f/f... hot, but rare. I see it occasionally, often with incest involved... (Which seems to be the big sale for a lot of writers.)
Edit: If I had to name the fetish...
For the consensual version? Lesbiflexible (Pun, but it works well, IMHO)
For the Non-con version of man on Gay woman? While the accurate name has been correctly identified by Loeman, I would prefer one that doesn't mean I often also have to read ones about a slutty hetero woman being "raped" into being a good woman... I think we need suggestions on that one.