
I wonder why a fever is a big thing in in yaoi or manga in general ? It's always a turning point in every story ,throw a fever in the plot and baaaam magic happens.. in my country if you have a fever or a cold they will till you to walk it off and no rest what so ever and no hospital or shit i couldnt skip a day in school or collage or work coz i have a fever or cold..

Considering how fever causes exhaustion and in extreme cases death, isn't that just a sign of your country's lack of care for its workers? It's used in fiction to either show a strong character's moment of weakness or give a LI a chance to care for their loved one, but it's still serious in real life when you get a fever. You don't want to spread sickness around if you can help it and you'll be under preforming with a sickness, anyway. It's better to rest and get over it faster.

Can someone explain to me again how he will be able to get pregnant ? And how he got the tatto in his billy and what that means?

I don't remember it being explained, my hunch is that tattoo will probably be the reason like womb markings etc (dunno I saw tattoos like that on hentai) but really https://i.imgur.com/WCIDZ5q.gif
That makes me feel lonely as fuck