Kinda sad he basically treats Saki and Haruka like male buddies perhaps because their boobs just aren't big enough to be "helpful" for him. Yeah, I know, he has a type. I'm guessing his middle school gf must've been stacked too going by that pattern.
We didn't get to see Iida-san, maybe they're a hag, or a man but in exchange here comes a new girl, Rin Ooyama. Of course there's another one. Enter the gyaru. Harems are not complete without one...
inb4 Iida-san is like some kind of MILF-type office lady manager character who shows up later.
"his
stepsister"
Hol 'up. Does Saki know something we don't?