Conveni-kun to Ryman-san

Ryosuke (gay, virgin), a college student working part-time at a convenience store, is passionately in love with Satoshi (straight), a regular customer and businessman. Ever since falling in love at first sight with his somewhat fragile and mysterious appearance, he fantasizes about the XXX aspects of this man, whose name he doesn't even know, and comforts himself with his right hand... Just when he's so in love he doesn't know what to do, an unexpected opportunity presents itself to get closer to him!

(Source: Takeshobo, translated)