It seems that there is a trend of older sister and young girl kind of stories with yuri as seem with UzaMaidand Happy Sugar Life. Watashi ni Tenshi ga Maiorita (私に天使が舞い降りた, Lit: An Angel Swopped Down to Me!) is one of those stories, but not as creepy compared to the other two.
Author: Mukunoki Nanatsu (椋木ななつ)
Publisher: Ichijinsha (Comic Yuri Hime)
Published: June 1, 2017
Where to Buy: CDJapan