I was like ... They had sex😳..? I thought that was just kissing..

Im the earlier chapter, when he had magic problem smth. The knight helped him to stabilize his condition by doing it though its not fully shown

Yes, but it was a very special type of kiss for adults (▰˘◡˘▰) with no clothes on...

Thank you, I read the chapter again... now I see

With different mediums ╮(￣▽￣)╭