It's my absolute favorite JAV ever; the actress choices & progression are great.
DVDES-716 and CESD-225 also have this theme but IMO are not quite as good. Other recs still welcome.
A theme I particularly like, but can't think of many examples of it: Mom and daughter being seduced by a third girl leading to 3P relationship.
The only ones I have as of now are MESS-023 and DVDES-662.
ja.wikipedia.org/wiki/あいり%26めいり
"二人の外見はよく似ているが双生児ではなく、ダブルユーなどのアイドルユニットを模している"
"They look a lot alike but rather than being twins, they are imitating idol units such as W."
¯\_(ツ)_/¯