You know, one thing I kinda appreciate about this story is the fairly strong sense of continuity. It seems almost every event definitively leads into the next, even though this is for all intents and purposes a 4-koma slice-of-life flavored story.
How wonderful for the other universes where this is a doujin and our Boi "touched" the BBs of onee-san and then it continues on and on to hand holding and such lewd things you can't imagine.