It's actually sad, I don't recommend it. It was a happy family at the begging with a foster father and a mother that already had a son. When the wife died the father was in depression, and those two where into an illegal SM club, so he started doing worse at his job. At some point the son said he wanted to move for college, and then the father starting paying more attention to him and kinda forced him in a relationship with him, the sad is that he was in love with his father at that point but the relationship was still forced, and when he was doing something the father didn't like he was asking him if he loved him and then he was forcing himself onto him.
╥﹏╥ Since he knew he was a man and couldn't have kids, he forced him to have that tattoo. At some point when their illegal club was going to be discovered he realized that he was doing something bad, but the son was denying it, saying that it's not. And one day the father disappearers and the son remained alone, and dedicated his life in sex but he was still sad. There is even a story like a "continue" that he finds someone that's into rough sex and they became a couple. Do u still want to read it, or should I just say the title of the one with him in the future, that one is more like the story behind that tattoo, because that came out after the one from the future. It's more like, they are showing us his past.
Guys, in an other manhwa a bottom had a tatto like the one that was formed on Kouichi, and that tatto meanent "womb", and if u actually search on google 'womb tatto' u can see it. So when Caius came for the first time inside Kouichi there is a possibility that a womb was created. So, I think we WILL see a baby coming.
ヾ(☆▽☆) ٩(๑❛ᴗ❛๑)۶