Anyone who can recommend me some good yaoi manga with fine art and has sequels or spin off...

I don't know if it's good enough, I chose the ones I liked
http://www.mangago.me/read-manga/bi_no_isu/ +
http://www.mangago.me/read-manga/kobi_no_kyoujin/ +
http://www.mangago.me/read-manga/bi_no_kyoujin_smoke/

http://www.mangago.me/read-manga/koishite_daddy/ + http://www.mangago.me/read-manga/love_kids/

http://www.mangago.me/read-manga/sabita_yoru_demo_koi_wa_sasayaku/ +
http://www.mangago.me/read-manga/renai_rubi_no_tadashii_furikata/ from ch. 3 +
http://www.mangago.me/read-manga/hadakeru_kaibutsu/ +
http://www.mangago.me/read-manga/azami/ (chronologically this is a prequel, but it's better to read it afterwards imo)

http://www.mangago.me/read-manga/akunin_o_nakaseru_houhou/ + http://www.mangago.me/read-manga/koi_made_hyakurin/ + http://www.mangago.me/read-manga/warudakumi_ni_mo_hana_wa_furu/

http://www.mangago.me/read-manga/nirameba_koi/ +
http://www.mangago.me/read-manga/shinobeba_koi/

http://www.mangago.me/read-manga/kimi_to_parade/ +
http://www.mangago.me/read-manga/paradise_view/

http://www.mangago.me/read-manga/memory_of_the_future/ + http://www.mangago.me/read-manga/kaze_no_yukue/

http://www.mangago.me/read-manga/ubawareru_koto_marugoto_zenbu/ +
http://www.mangago.me/read-manga/suki_toiunoni_nazekashira/ +
http://www.mangago.me/read-manga/ai_ga_matteru/

http://www.mangago.me/read-manga/kyuuso_ha_cheese_no_yume_omiru/ +
http://www.mangago.me/read-manga/sojou_no_koi_wa_nido_haneru/

http://www.mangago.me/read-manga/hitorijime_boyfriend/ + http://www.mangago.me/read-manga/hitorijime_my_hero/ the sequel/spin-off is much better imo

Maybe Kuroneko and Warui series, but I'm not a huge fan. One of my ultimate faves is Rules, but it's not for everyone, so idk if I should recommend it. It's long and bittersweet, even sad at times. Miyamoto Kano tends to make series like that (e.g. Calling)

Thank you soo much!