Manga like Imouto wa Taiyou deshita.

Ranked by AniList's community-voted "readers also liked" data and how often forum discussions mention a title alongside Imouto wa Taiyou deshita..

1. Onee-chan no Kuchibiru 52 1 community votes
2. Onee-chan no Kowai Kiss 1 community votes
3. Onee-chan ni Onegai 1 community votes

Ask Tsundoku for a personal pick

Tsundoku reads the actual forum threads and your own AniList history before it recommends anything — every answer shows its sources.