Yeah, I think it's too late for that, and the other NTR scenes stop short and allow for the What Ifs that we've gotten. The later chapter ones, the whole scene plays out and you can just go back and choose the opposite.
Some definitely dont go on long enough (I get Ch1 was a teaser for what we would see) but it isn't just the early ones, for example 2 goes the full way.
Ch1 (if we ignore its a teaser), Ch3, Ch4 (before the what if), Ch6 and i'd say Ch8's catherine was stopped too short. maybe the what if was always planned to come out for these eventually, but if not, then yeah, not long enough.
2, 5 & 7 were fine. No complaints really from them.
edit: I actually think the bad ends are where Dartred's CTT might have an advantage over PV.