3. the whole widows thing: that was the dead guy's gene that they want to pass down so widows making baby with each others is totally pointless. And if what they need is the girl's then random new girl/guy would do, no need to specifically go for widows.
I'm assuming it is the genes of the widow's family they are after (since as you point out it would be pointless to do it for the deceased husband's family). As for why they match up widows, maybe they have a social taboo around widows remarrying or otherwise coupling with others, but there is an exception for other widows since both are in the 'same situation'. Not particularly logical, but wouldn't be the weirdest social convention I've seen (both in real life and especially in fiction).
It's always so funny to me how the chapters of this anthology manage to cram an entire volume's worth of exposition and plot into a single chapter. As always, I wish there was more time put into the character work instead of the plot, or, if so much time had to be put into the plot, that the plot be more original and compelling.
had everything. zero miscommunication. zero fucking around. just one bad bitch domme fem with her malewife masc. AND fpreg just to hammer down the complete anti-bechdel test plot of this masterpiece.
Thank you author, thank you MangaDex, thank you translation team, thank you the Internet, thank you manga and its inventor, thank you my parents and thank you my laptop for helping me be able to read this masterpiece