maybe its this one
https://www.mangago.zone/read-manga/kishi_sama_ikuseichuu_to_doukyo_shimasu/
Nope. It's not what I'm looking for, but it seems interesting, so I'll give it a try. Thank you. (≧∀≦)
I want to XXX with you?
Nope, I think it has shorter amount of chapters and has black and white drawings. I think it was a oneshot, although, I'm not sure.
It's okay, though, since I'm not really looking for it that much. I just suddenly remembered, that's why. (=・ω・=) Huehue.
It's a BL manga... And there was this person's laptop where I think on the screen, there's a fantasy hero-like scene which is probably a story or a game.
A few pages later, a character from that story or game ended up in their house, which I don't remember if it was a hero or another fantasy character, but it was some character that was on the laptop screen before.
And I think smutty stuff happen between the laptop owner and that character.