Hmmm. I assume that there is an issur of lo sikrivu by Eishes Ish. Though you seem to be right that it doesn’t fall under “sh’er bisaro” or nidda. I can definitely see it m’svara though we need a pasuk.
It’s been awhile since I learned meseches Yevamos so I can’t remember all the limudim but I’m pretty sure that we learn all issurei erva from each other.
Maybe Joseph can help us out