Recommendations

So this has similar concepts to BJ.
http://www.mangago.me/read-manga/23_ji_no_time_shift/
And this one has cold seme.
http://www.mangago.me/read-manga/oreshika_shiranai_karada/
You can also try warehouse it's kinda similar idk since it's not completed.

- http://www.mangago.me/read-manga/body_complex/ ?
- http://www.mangago.me/read-manga/blood_bank/?M0hI
- http://www.mangago.me/read-manga/mobius_strip/
- http://www.mangago.me/read-manga/chou_to_hana_no_kankeisei/
- http://www.mangago.me/read-manga/moon_and_sun_abe_akane/ kind of ?
- http://www.mangago.me/read-manga/truth_or_dare/ kind of
- http://www.mangago.me/read-manga/yoru_to_asa_no_uta/ they don't end up being the sweetest but asaichi definitely warms up to Yoru
I don't really remember more

http://www.mangago.me/read-manga/ringo_ki_kara_ochiru/ (chapter 1)
http://www.mangago.me/read-manga/mata_ashita_7_jihan_ni/ (sequel)

This one is still unfinished. Hes acting cold on latest chapters, but im pretty positive theyll be more lovey dovey in the future. I dont know though, because this has a psychological aspect. So, its a bit hard to predict.
http://www.mangago.me/read-manga/boy_meets_maria/

Really cold at first. But definitely warming up in the later chapters. Still unfinished.
http://www.mangago.me/read-manga/yuusha_in_maou_n_chi/

Still unfinished
http://www.mangago.me/read-manga/fushigi_pot/

Psychological
http://www.mangago.me/read-manga/sneaky_red/

http://www.mangago.me/read-manga/ookami_he_no_yomeiri/

Still unfinished. But im positive the seme will fell overheels for the uke later. Hes starting to fell for him on the latest chapter.
http://www.mangago.me/read-manga/bidou_wakadanna_koi_shitau_wa_koushoku_otoko/