hara-san will not have any red string attachment for the rest of his life coz' his real partner (kaoru) didn't have any red string. remember from the prequel series, kaoru helped the uke to cut the ties but at the end, the seme still in love with the uke (strong desire) and the red string re-connected. same with hara-san who have strong love desire for kaoru made him "not connected" to anyone so he can love kaoru forever.
hara-san will not have any red string attachment for the rest of his life coz' his real partner (kaoru) didn't have any red string. remember from the prequel series, kaoru helped the uke to cut the ties but at the end, the seme still in love with the uke (strong desire) and the red string re-connected. same with hara-san who have strong love desire for kaoru made him "not connected" to anyone so he can love kaoru forever.