Obviously it’s standard for hentai girls to be hot, but Rinko is very special to me despite having a pretty generic “blue haired anime girl” look.
I think Ut might because when she has her hair in a ponytail she reminds me of Reina from fire emblem, who doesn’t really have much inthe way if hentai.
That feeling when one of your favorite girls is so obscure and unpopular that you are using other characters as surrogates...