Itoshi no XL Size Zokuzoku

Yamamoto, an apprentice sake brewer with a long-standing drinking habit, starts working at his boyfriend Kobayashi's family brewery, Kobayashi Sake Brewery. Determined to keep his distance, Yamamoto insists on living alone in an apartment near the brewery until he becomes a full-fledged brewer. However, Kobayashi frequently visits, suggesting that their small bed and cramped room are unsuitable for two grown men trying to be intimate.
(Source: Ichijinsha, translated)