Not super similar to what Wayama Yama writes, but these are slice of life with gay subtext or just bromance with big shipping potential (and material). Some are tagged as shounen ai on Mangago, but they're not actually BL.
https://www.mangago.zone/read-manga/country_diary/
https://www.mangago.zone/read-manga/atarashii_joushi_wa_dotennen/
https://www.mangago.zone/read-manga/bimyou_ni_yasashii_ijimekko/
https://www.mangago.zone/read-manga/ore_no_joshiga_eritowano_nie_tare_kawaii/
https://www.mangago.zone/read-manga/tanaka_kun_wa_itsumo_kedaruge/
https://www.mangago.zone/read-manga/hinatama/
https://www.mangago.zone/read-manga/gakuen_babysitters/
https://www.mangago.zone/read-manga/a_mild_noble_s_vacation_suggestion/
are there any bl coded slice of life manga/manhwa/manhua/whatever out there ?? similar to how wayama yama writes stuff.. ╥﹏╥