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Not sure the exact conditions to get the "handsome college professor", but I found him in my playthrough with Fawn and thus Cassie's routes complete, Male Partners enabled and with the medical class in Upper New Ark's college taken. He's at the college.

MPreg, no clue, but Cumflation is received by losing to the Infected Scientist in the infested Science Lab Tower. There is a single Trap, and you can find him by working as a bouncer in the New Ark nightclub, the Rock. He has a random chance of appearing, I think.

for the MPreg and cumflation, lose to the infected scientist in the infected lab tower.

 traps, its kitty, you get her(him) while working as a bouncer in the rock.

 Handsome college professor, that is cless in upper new ark, you need to buy the counterfeit pass then get a massage from lin lin to get quality pass to go up, attend college (medical), pass the test (ins), and then meet cless.

 Weird fish, tinker with your items to combine worm and weird fish, and it is basically a lottery, from getting junk to some uhh... stamina drinks...? what the hell is this fish eating?

Yeah, unfortunately certain kinks don't have as much content as others yet. That'll change with time though!

Everyone loves weird fish. Whether they know it or not.

I haven't encountered MPreg but I did encounter Cumflation and trap kink.

You get Cumflation by being defeated by an infected scientist.

Trap is one of the new characters added into the game. 

I recommend activating all the kinks for all the characters except for a few that changes your character or changes on other characters like furry if you don't prefer it