Shounen-ai.
28 y.o. straight editor of a women's magazine x 54 y.o. openly gay culinary researcher writing for the magazine.
Researcher is actually old, grey-haired. He feeds the editor and enjoys watching him eat, puts up a cool older man front before him, editor adores the food and falls in love first.
Sweet, mostly focused on the development of their friendship and affection for each other, as well as the food and their relationship with it.
20-something seme x 40 y.o. uke.
Uke is a prideful man down on his luck. Doesn't look old. He made a bad investment, lost his gf and quit his job. Seme had previously told him not to invest; uke runs into him again and begs for his help. Seme falls in love and lets uke live at his sharehouse, but it's for gay people only, so uke has to pretend to be in a relationship with him.
Funny and a bit dramatic, focused on uke's struggles and growth.
Koh-Boku