https://www.mangago.zone/read-manga/kimi_wa_natsu_no_naka/ and pretty much anything by this mangaka (nagisa furuya) is really good. I think almost all their works are shounen-ai
https://www.mangago.zone/read-manga/online_game_nakama_to_sashi_off_shitara_shokuba_no_onijoushi_ga_kita/ this one has mixed opinions on how good the build-up is but I really loved it. It has been dropped by the translators but is getting official translation in English
https://www.mangago.zone/read-manga/koi_wa_kitsune_mouyou/ (oneshot)
https://www.mangago.zone/read-manga/karasugaoka_don_t_be_shy/
https://www.mangago.zone/read-manga/fukou_kun_wa_kiss_suru_shika_nai/ this one has suggestive scenes, but they don't show anything
1. Fools
2. Path to you
3. Cinema next door
Cute short shounen ai pleaseeeeeeew with a really good build up