Loving Little by Little!

Bro.... you are required to let your cute, younger stepsister call you Aniki during loving vanilla sex!
(That's the best part!!)

Bro complex, sis complex... it's just complex.

And no jokes about incubators, witches, or grief seeds, people. This Madoka has the wrong hair colour and is straight. (Stern gaze over the coffee cup.)

Of course, she was the package. The vegetables were just the garnish.

It’s his duty as stepbrother to help his stepsister when she is stuck!

Sees new work by Cuvie-sensei ... see chamber on revolver spin before being slammed into place, not knowing where the bullet is.

IMHO, it's hard to tell in only 18 pages just how it all began, or just who made the first move towards (koff-koff) upgrading the relationship from step-siblings to (perhaps at the moment) sex partners.

At least by the time this one ended, vanilla fans have dodged the bullet (this time). And sometimes, that will have to do.