Kasane to Subaru

Shibata Kasane, a graphics designer at a toy design and development company, is worried about something. Her troubles began when she accidentally grabbed her colleague Enokida Subaru's ass! Kasane was intrigued by how similar Enokida's ass and her favourite childhood character felt. But at the same time, she felt guilty because Enokida might have been uncomfortable. Enokida said "I don't mind," but he had a pained and frightened expression. Kasane was overcome by the urge to apologize profusely! On the other hand, it looks like Enokida has a secret...

(Source: Kodansha, translated)