reccs

Not a highschool romance!! But try this out
http://www.mangago.me/read-manga/the_lady_and_her_butler/
If not I can recommend you something else

Vitamin C Vitamin D ... not sure if it's like Horimiya since i've only watched ep 1 of it but, Vitamin C Vitamin D is a highschool romace (it's not a bl). It's also completed. Here's the link: http://www.mangago.me/read-manga/vitamin_c_vitamin_d/

I've read this one! What else? :D

Hi sorry I just got done with school but here are some I recommend
I tried recommending ones with very subtle humor-ish and some romance

Mangas turned animes (so if you want to watch the anime version go ahead!)
- http://www.mangago.me/read-manga/tanaka_kun_wa_itsumo_kedaruge/
- http://www.mangago.me/read-manga/asobi_asobase/
- http://www.mangago.me/read-manga/handa_kun/
- http://www.mangago.me/read-manga/akkun_to_kanojo/
- http://www.mangago.me/read-manga/please_take_my_brother_away/
- http://www.mangago.me/read-manga/3d_kanojo/
- http://www.mangago.me/read-manga/ookami_shoujo_to_kuro_ouji/ (this one was ok-ish)
- http://www.mangago.me/read-manga/oremonogatari/
- http://www.mangago.me/read-manga/kuragehime/

Bl’s
Shounen Ai
- http://www.mangago.me/read-manga/never_understand/
- http://www.mangago.me/read-manga/ganbare_nakamura_kun/
- http://www.mangago.me/read-manga/himitsu_ni_shiro_yo/
Yaoi
- http://www.mangago.me/read-manga/i_m_banging_my_rival_from_a_parallel_world/
- http://www.mangago.me/read-manga/oh_my_assistant/
- http://www.mangago.me/read-manga/mobyama_aji_to_mobtani_crou_no_kareinaru_nichijou_e_no_chousen/
- http://www.mangago.me/read-manga/love_me_dramatically/
- http://www.mangago.me/read-manga/yowamushi_danshi_renai_hajimemasu/

Straight romances
- http://www.mangago.me/read-manga/yumemiru_taiyou/
- http://www.mangago.me/read-manga/kimi_ni_koishitei_desu_ka/
- http://www.mangago.me/read-manga/mizutama_honey_boy/
- http://www.mangago.me/read-manga/sangatsu_wa_ore_sama_ni_narimasu/
- http://www.mangago.me/read-manga/iris_zero/
- http://www.mangago.me/read-manga/yamada_kun_to_7_nin_no_majo/

Sorry! These were all I could think off of the top of my head I’m not on my main mangago acc(I forgot the password too it so...) if you need more I’ll think of more

No problem!
But, wow, that's a lot. Thank you so much!! I'm going to go to town on these (≧▽≦)