So far so good, I reaaaaaaaaaally hope they won't pull a "not related by blood" cliche, being an actual incest is the only thing that would prevent souta and his sister from being a completely boring and shitty couple.
@SunSun Well, when you put it like that... hmm, maybe slowly phase the girly clothes down to mannish lesbian style, then to effeminate man, I think the harem will be enough to validate the manliness of someone dressed in slightly off-gender clothes.