Pretty sure she is dead by now.
Going from Japan to EU back then should take a very long time. And he took the other gun so those lords probably thought that he is either dead or ran away.
That is the whole point, it is not like a gun, which you can shoot each target a bullet.
Once you ejaculate, you just empty out your storage of sperm so... either having extreme production speed or gigantic balls.
Hell, I may be a sex noob but the maximum for me was 3 shots spread out from...
Well, at least this is not or not yet a Japanese sword slicing everything like grass manga so some mistakes here and there are acceptable for me as "the mangaka is also just a human".