Help

Lol most of them end up ecchi

╥﹏╥ ecchi with a harem of girls

Its so rare to find one thats not, i wonder if they even exist

Try this
https://www.mangago.me/read-manga/my_wife_is_from_a_thousand_years_ago/

U can try your smile is a trap is kind of a slow burn tho

Adults
https://www.mangago.me/read-manga/marry_me_yuuki_miku/

https://www.mangago.me/read-manga/a_rare_marriage_how_to_grill_our_love/

https://www.mangago.me/read-manga/telework_yotabanashi/

https://www.mangago.me/read-manga/futari_ashitamo_sorenarini/

https://www.mangago.me/read-manga/majo_senpai_nichijou/

https://www.mangago.me/read-manga/kyou_mo_beranda_de/

High school
https://www.mangago.me/read-manga/last_game/


There's more, but I'll just give out a few for now.

Surprisingly, there's a lot actually

This trope is usually found in shounen genre + isekai trope. If you filter these out, you actually can find more.

I know you said modern but i really like this one. So I want to recommend it to you. If you haven't read it, I hope you can give it a try.

https://www.mangago.me/read-manga/will_you_marry_me_again_if_you_are_reborn/

Koe no Katachi, Salty Studio, Mayo Chiki!, Can't See Can't Hear But Love

If you're okay with sci-fi or fantasy or stuff like that, there's: Zense Coupling (multiple POVs) and Goodbye, In-Law! (both POVs)