>>281614584
That doesn't really track. None of her heroines in the past have had a similar archetype as that of Tsubasa, and the winner has always been the girl that needs MC the most.
Also she kept Rui "pure" (at least on-screen) and even Hina despite being a working adult at the start of Domekano had one single partner besides Natsuo for her whole life. The girls in GE also had one single ex-boyfriend before jumping on the MC train.
>>281615694
I think Sasuga believes that sluts deserve the chance to turn themselves around, but that men do deserve the reward of having a faithful partner if they're willing to overlook past sluttiness.
She's never really been kind to cheaters and she keeps her heroines surprisingly faithful beyond being used goods (mostly).
I guess she also wants to drive the point home that even (former?) sluts can become faithful.