This is the R18 version which includes adult sex scenes!

Based on an adult manga by Kaizuka. Sudou Kazushi is a university student who is visited by his two childhood friends, the sisters Shirakawa Ayane and Shirakawa Kotone. When Ayane discovers that Kazushi not only forgot to buy her pudding but is also using her special lotion in the bath, she decides to take revenge and join Kazushi in his bath along with Kotone. Will the perverted Kazushi be able to remain indifferent to them both?