I don't understand the last chapter.
They first meet 8 years back in that flower garden, but they were not lovers not friends, the uke was in love with Sano. And Sano loved the uke as well but he never told him, and that's why he put that tattoo on his so he ca have a part of him always with him. Something that will not change. So the uke didn't know that Sano loved him. He was finally honest before leaving.
Hope i did clear the things a little
i hate the storyline so much. the sex is good tho