https://toonkor.blue/%EC%86%8C%EB%85%84%EC%9D%84-%EC%9C%84%EB%A1%9C%ED%95%B4%EC%A4%98
These are raws, though
http://www.mangago.me/read-manga/blue_sky_complex/
http://www.mangago.me/read-manga/fools/
http://www.mangago.me/read-manga/soredemo_yasashii_koi_o_suru/
http://www.mangago.me/read-manga/koimonogatari/
http://www.mangago.me/read-manga/umibe_no_etranger/
http://www.mangago.me/read-manga/arashi_no_ato/
http://www.mangago.me/read-manga/hana_wa_saku_ka/
http://www.mangago.me/read-manga/goodbye_lilac/
http://www.mangago.me/read-manga/bokura_ga_koi_wo_ushinau_riyuu/
I think you would like Heesu in Class 2! It's a slice of life based yaoi that has a realistic pace concerning character development and relationships. It follows a guy named Heesu who's been in love with his best friend since they were in elementary school. He's never been able to tell his friend how he feels, and now that they're both in high school, another guy has taken an interest in him too. Heesu has to decide if he wants to confess his feelings to his friend, or if he wants to give this new guy a chance instead.

Do you know any good realistic slow-paced yaoi? Something like "Reply"