IMO the quality of the sequel (April) is kinda dropped compared the OG (Feb). The focus just shifted from Akira (The step-sis) to Satsuki (The friend), who still not being shown having sex with the MC (Issa-kun AKA your self-insert!) YET. It seems the author either A) Planned to go full 3P route yet afraid this vanilla will turned to NTR or B) Save all the money shots and 3P stuffs for full manga and sell it on sites like FANZA (And we all know it'll sell like hotcakes - the posts viewed number during day 10-15 or "anticipation for 3P" section is through the roof compared to "vanilla" section).