Anata wa Watashi no Unmei no Hito

Megu has recently discovered she is an omega, and when her friends tell her there is an alpha in their all-girls school, she wonders if her pheromones can reveal who it might be. When Megu runs into the vice president, Akina Nagamine, in front of the student council room, her inner omega awakens a desire she has never known, causing her to beg uncontrollably for the other girl's embrace...

(Source: Anime Planet)