Contents: Straight (may contain nuts), incest, group, shota, loli
May contain traces of male anal play and fan in-jokes.

I can't follow the story, as I don't speak Japanese. (An all too common statement, I know.) To appearances, Hideki is taking Chii in for maintenance or diagnostics at Minoru's place. Perhaps there are questions yet unanswered about her at this juncture.
Whatever the excuse, the stranger sexual situations are as follows:
Minoru (12 years old) is getting sexual attention from a persocom closely modeled on his sister. (Plus maid outfit, canonical.)
Shinbo's getting hot skitty-on-whalord action from his laptop persocom, Sumomo.
Chii takes on Minoru herself, and after bringing him to orgasm seems to get a notion that he take her in a more traditional manner. The screen goes black as Hideki makes a statement. While I don't speak Japanese, I'd bet you dollars to donuts that's along the lines of, "Wait, not there!" If you've seen the first episode or read the first issue, you'll know why. (Canonical.)

The next part is equally inexplicable, and fairly purely group-on-shotacon, followed by some one-on-one with the sisterbot again.