Tonari no Sugar Boy

Overview

Akiba is a programmer who works from home, and Shima is a student who's preparing for his university entrance exams that just moved in next door. After learning that Shima is applying for his alma mater, Akiba offered to help tutor him and in exchange he asked Shima to help look after his family dog part-time. With the frequent visits, Akiba finds himself getting attracted by Shima's shining and clear eyes. He's also absolutely mesmerized by the mature behavior that Shima occasionally shows. Before they realized it, love has started to bloom in the time they spent together, however...?

Source: AniList