Alright, so you wanted some ideas, right?
Perhaps there could be a very proud, pride ridden, judgemental species, that consider it a competition to not only mate, but to see who can gestate more babies at once, and in more areas? So a hermaphroditic member of that group that was pregnant in the womb, breasts, balls, and rear, with, say, 15 young per womb, would be considered to be pretty much the champion breeder? Could be a really competitive species. Don't have anything on the mind for them, though.
Also, what about a larger species of more draconic appearance, maybe with individuals varying from 15-25 feet tall? Rather hermitic in that they're scarce, and tend to live in far away, hard to reach places? They could be more gentle giants, that usually just keep to themselves, and tend to keep hoards of valuable materials (not essentially treasure: Some subspecies or certain individuals could be drawn to other valuable things: Weapons, electronic devices, machinery, magic relics, fossils, even collections of living creatures that they don't do anything but take care of (like an aquarium, for example)? Of course, like ordinary dragons, a hoard size is respect for you. Elemental abilities, subspecial dimorphism, sizes, and age can be decided, but I'd imagine that these things can live for centuries, if not millennia, and that generally, the bigger they are, the older.
Now, for the part about them that you'd want to know more about: Their breeding. It'd be a strictly male race, but they have one problem: They're all sterile… …But they're immensely fertile. The only way they can reproduce is by getting their balls knocked up. They can either kidnap some people, or persuade them to join (through love, since these guys are actually really kind and tolerable for the most part), or any other methods possible (including buying people). They usually either promise a good amount of their loot, a good place to live, or the ability to be their lover for those that stay and help to tend to the ever growing collections (and they'd even have people out to hunt for items for them). They'd gestate VERY slowly (taking 5-10 years to gestate), BUT are incredibly stretchy, and have no upper limit to how pregnant they can get. They'd also have the ability to control if and when they give birth, usually only deciding to do it if they have to, or they feel like having their young. Even a practically barren human male can put at least twins i
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