Avsolutely agree with you on how the more pure routes should have been kept as they were. As for Clara in Misfits: While she speaks to Amy about the handjob, it is also clear that Clara herself will not go further than that. This is something of a rule for her, it seems. Also please remember that Clara is the only(!) one of the girls at the party who does nothing with the strippers.While I'm a sick pervert who always plays every game to max corruption, humiliation, and degradation, I agree with you totally that it sucks the more pure routes turned into NTR. If a dev says their game will have a pure/love/vanilla route then they for sure should have it. However I disagree on your interpretation of Clare in 12 Days. When she said "It's just a handjob, not cheating" she was speaking directly to Amy. She knew Amy had a boyfriend and was just trying to convince her to do it. This had nothing to do with Clare's personal morality, in my opinion, and of course whether she had a boyfriend is never addressed. Also remember the game opens with her flirting with/trying to fuck Amy's Dad. A little foreshadowing of the Old Man kink that features heavily in Misfits.
It is correct that Clara flirted with Amy´s Dad and it is a foreshadowing of her faible for older men, but it is also mentioned in dialog I think, that Clara is flirting much, but it does not go further.