This firs your description perfectly: http://www.mangago.zone/read-manga/nirameba_koi/
You can also try those:
http://www.mangago.zone/read-manga/ichiban_chikaku_de_koi_o_suru/ (2n story)
http://www.mangago.zone/read-manga/oko_sama_star/
*fits
Stupid small keyboards
here's some of my faves~:
http://www.mangago.zone/read-manga/nirameba_koi/
http://www.mangago.zone/read-manga/oko_sama_star/
http://www.mangago.zone/read-manga/maria_boy/
http://www.mangago.zone/read-manga/yoru_to_asa_no_uta/
http://www.mangago.zone/read-manga/doutei_hitsuji_to_abazure_ookami/
http://www.mangago.zone/read-manga/michi_to_no_souguu/
http://www.mangago.zone/read-manga/koitomo_/
similar height/body build like 1cm apart:
http://www.mangago.zone/read-manga/owaranai_fukou_ni_tsuite_no_hanashi/
http://www.mangago.zone/read-manga/risou_no_koibito/
I'd Luke to read a manga where the uke has a bigger build than the same, and is maybe a delinquent or mean looking but he's actually really adorable? Or at least adorable to the seme.. ヽ(*≧ω≦)ﾉ Thank you!