Natsuyasumi(1999)

Natsuyasumi

Maki lives with a family thats very dependent and demanding of him. He finds relief with Dasku, a young looking man who cant seem to do anything himself. Being more than happy to help Dasku out, as he is finally given a thank you for his efforts, he easily falls for the younger looking man. Things are happy between them until Maki learns just who Dasku is, and then misadventures ensue.

(Source: Shinshokan, translated)

Note: Chapter count includes two extras.