Hey, nerds! Google's failing me on this one, and I somehow failed to bookmark it first time I came across it. Which sucks! It was totally my thing! The scene that stands out in my mind is of our massive jerk of a protagonist I think bathing? A hot spring setup, maybe? His female bodyguard comes in to deliver some news and he basically compels her to bend over for him on the spot. He blows his load in her and she complains that she might be carrying a royal bastard now. Which...yeah. That's hot! Would love to revisit but cannot find it. Ring any bells?
Oddly enough it does but I can't for the life of me remember which story it was. The Royal Succession maybe?
it was A Fantasy Dynasty! I thought it was in a much shallower story, but there it was, lurking! the specific node is https://chyoa.com/chapter/Cum-Inside-her.317150