Taller AND an assertive uke (in private) rare dynamic, the seme kinda looks like an uke but it doesn't take away from their actual position, kinda rushed ending, in a way it's open ended, and not much happened really. The oneshot was just angst disguised in fluffy clothing, might be off-putting coz of the huge age gap and relations (distant relative), but then again it was somehow able to pull it off, at least than most that try to do the same.
Kimi no Oto ga Nari Yamanai