@Jenster looked at your suggestion you might like some of these. If you like these and want a few more @ me .
https://mangadex.org/title/44904/toorigakari-ni-one-point-advice-shite-iku-type-no-yankee
the one below is slow and there is a lot of teasing but it is low level. I like the gradual growth and that they have moments where they shine with out it being extreme, thinking the cat scene.
https://mangadex.org/title/26630/yancha-gal-no-anjou-san
https://mangadex.org/thread/307044/3
slow office romance
https://mangadex.org/title/23825/senpai-ga-uzai-kouhai-no-hanashi
Not a romance, at least that I saw last time I read or am forgetting it, although it is tagged that way. But still a good read that makes you feel good.
https://mangadex.org/title/5465/gakuen-babysitters