Saeki, a part-time delivery person, has someone he's interested in.

It's Yuuki, the shut-in who he delivers to about twice a week. Yuuki is so tall that Saeki has to look up when he opens the door, but Yuuki tries to make himself look small even as he turns bright red, seemingly feeling some kind of affection for Saeki. However, while Saeki is gay, his type is delicate, small, and cute twinks. Yuuki is the exact opposite of his type so he's not feeling any sort of desire for him, but one day he discovers Yuuki calling out Saeki's name as he pleasures himself...!