Bakura would probably go wide-eyed and not exactly sure how he should take it - probably arch a brow and ask Marik what he would honestly do if Bakura -doesn't - let him kill the child (be it asking him not to or demanding or whatever) and he ends up having it... and then question wouldn't Marik want to have something that would in a way possibly represent him or carry on what he can't/doesn't.
Re: Arrogance and Malepreg
Bakura would probably go wide-eyed and not exactly sure how he should take it - probably arch a brow and ask Marik what he would honestly do if Bakura -doesn't - let him kill the child (be it asking him not to or demanding or whatever) and he ends up having it... and then question wouldn't Marik want to have something that would in a way possibly represent him or carry on what he can't/doesn't.