They do and are in the original webcomic version, this is the serialized published version which is going way slower and a little bit differently than the OG.
the onee-shota relationship got more development on panel than the main characters, author really let this get away from them. and the fanbox lewds are merely titilation, not lewd, and unsatisfying
i think zyugoya snuck shigerin in as the neighbor with the young son in chapter 50 of my childhood friend was broken. that also may be a completely unrelated or unrevealed character, as the faceless neighbor woman isn't quite stacked enough imo to be ochiai or shigerin