You're referring to the popular Japanese light novel and anime series "Uchi no Otouto, Maji de Dekain Dakedo, Mi ni Konagatterunda"!
. It consisted of short episodes (approximately 20 minutes in total for the season). Availability uchi no otouto maji de dekain dakedo mi ni kona updated
The story follows Nao, a petite high school student who is physically small but possesses an unusually large anatomy. His older sister, Chiaki, discovers this and invites her two friends—Nagisa and Yukiko—to "come see" him, leading to the various adult scenarios depicted in the episodes. Cast and Characters Nao: The younger brother. Chiaki: The older sister who initiates the plot. Nagisa: A mischievous, dark-skinned girl with blonde hair. Yukiko: A black-haired friend of Chiaki. Current "Updated" Status You're referring to the popular Japanese light novel
Unlike weekly shonen juggernauts (One Piece, My Hero Academia), this series drops chapters randomly. Fans have to actively check for updates, leading to repeated Google searches. MangaDex (search for "Uchi no Otouto")