This is definitely my cup of tea, if you manga recoms like this (adult woman with younger ...

Here you go: http://www.mangago.zone/read-manga/yakumo_san_wa_edzuke_ga_shitai/

Similar setting, reverse gender, less of an age gap (with more romance) http://www.mangago.zone/read-manga/tsubaki_chou_lonely_planet/

Same gender, similar age gap, but they don't live together just meet often (this one is a bit more realistic)
http://www.mangago.zone/read-manga/watashi_no_shounen_takano_hitomi/