ボクは都合の良いレンタル弟!姉が女友達にボクをレンタル!一緒にお風呂に入ったり一緒に布団で寝たり…疑似弟体験を楽しむ姉友。でもお互い体は大人
I'm a convenient rental brother! My sister rents me to her female friend! Take a bath together, sleep on a futon together... A sister friend who enjoys a pseudo-brother experience. But both bodies are adults