Requesting Florence Nightingale (FGO) mating with one of these enemies. Whether it's from her being defeated in battle or performing an experiment on their reproductive capabilities, I leave the choice in enemy and scenario to you I just request them to have horse cocks. Nightingale is a nurse and kind of stoic and expressionless so her gaining a lewd expression would be hot.
In my sloppy reference sheet I included some in-game skills that could be used if you wanted. Charm for example, constantly being reapplied from mating pierces through Nightingale's limited debuff immunity that she applied beforehand or something or another. I really love impregnation/pregnancy/birth so if you're feeling up to it including any of those, please do!

Sorry for the sloppy reference sheet, here's the original size if it helps to read the text/see! Thank you for your time and consideration! https://files.catbox.moe/1ayx2d.png