https://www.mangago.me/read-manga/define_the_relationship/ (I feel like i reread this once a month lmao)
https://www.mangago.me/read-manga/natsume_san_wa_hirakaretai/ (such a sweet loving relationship with a top that takes extra measures to reassure his partner)
https://www.mangago.me/read-manga/moratte_kudasai/
https://www.mangago.me/read-manga/yuki_chan_aishiteru/
https://www.mangago.me/read-manga/chichi_no_aijin/
https://www.mangago.me/read-manga/scent_spark/ (really sweet omegaverse)
https://www.mangago.me/read-manga/i_ll_make_you_my_number_one_idol/ (this one is so cute)
It's not only comfort and feel good but Vassalord is a good vampire manga that I have reread.
Has some dark themes not between them but there are some strong things with animals. However the relationship between them is sweet: Kyuuketsuki to Yukai na Nakama-tachi
Carrying My n00b Waifu
Don't Mess With the Puppy!
A Guide Out to Succeed
Honto Yajuu
Kowamote no Rinjin ga Ω datta Toki no Taishohou
Stigmata - Aikon

Does anyone have a good comfort bl, with lots of fluff