Even tho I still really enjoy this game (mainly because of the female models, MC's decent overall appearance, and the combination of harem, incest, and pregnancy tags), I don't think it is a "good" harem game. Like in games like "Grandma's House", Strong Desire also suffers from too many LIs with most of them having only a few screentime, making them more and more forgettable unless the updates focus on them. I too have to constantly check out the character chart because I don't have a good recollection of all the LIs except MC's fiancee Anna. In this episode the dev does give us some explanation about Anna's cuckquean nature, but it just feels more like a way to introduce another new LI (Cassie, your ex-gf). And like you said, It just seems that like MC from the start just doesn't think too much of Anna's cuckquean nature, instead of deeming it as a gateway to fool around without consequence, which is what cuckquean is all about ofc, but I just think MC should have more reservation about this idea than just jumping into the first pussy he can plow instantly.