age gap

https://www.mangago.zone/read-manga/on_doorstep/

I'm pretty sure it's legal...?

I've read that but thank you !

That's too bad, anyways good luck on your search

https://www.mangago.zone/read-manga/boku_no_omawarisan/

https://www.mangago.zone/read-manga/koi_wo_suru_tsumori_wa_nakatta/

https://www.mangago.zone/read-manga/nights_before_night/

https://www.mangago.zone/read-manga/the_good_teacher/

https://www.mangago.zone/read-manga/joou_to_shitateya/

https://www.mangago.zone/read-manga/mujaki_na_wanko_to_nekokaburi/

All of these have Older uke

Oh, I just remembered this one https://www.mangago.zone/read-manga/thirty_years_old/
But it's pretty popular so you've probably read it