I get your harem point. I disagree about your *nc*st point. The MC didn't know they weren't related. This turned me off from his personality. Sure, this isn't the real him, just a body he took over, but still the fact that he just rushes to kiss a person he thinks to be his relative is creepy. Imagine a reincarnated MC kissing their mom because "that's not my real mom."
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im reading in 1 part and it cuts off to the future