Hey. I'm looking for mmm or mmm+, fff or fff+ books. Any suggestions?

Depends on kind of story/plot you are looking for? (If at all?)
I liked this one:
https://www.amazon.com/Three-Meghan-OBr ... +the+three

Try Sloan Johnson's Triple Play. It's part of a series and the whole series is worth reading. But this is the book in the series that focuses on the male tuple of the series.

For MMM, I recommend The Protectors Series by Sloane Kennedy. This series is mostly MM, but two of them - the first one, Absolution and fifth one, Vengeance - are MMM. And I really enjoy her books and I think that it's worth reading.