No
Yes, but it isn’t shown.
It’s been a while since I’ve read it but they did it and then it fast fowards to after and then li-huan is embarrassed and he feels bad. And then the other dude (can’t remember his name) is like “it’s ok you did a good job and you were gentle.” So yeah
I would say it’s shown quite a bit in chapter 104.5. Check it out to get an idea.
no
Ok so in the manga Here U are do they ever have sex. ╮(￣▽￣)╭