Alcyone, Celaeno and Asterope

The other Pleiades' seduction by Poseidon and Ares was less interesting.

Alcyone

Poseidon seduced Alcyone (Ἀλκυόνη) who became the mother of Hyreis, Hyperenor and Aethusa.

Celaeno

Celaeno (Κελαινώ) had Poseidon as her lover as well, and became the mother of Nycteus and Lycus. They became regents and rulers of Thebes.

Asterope

Ares seduced Asterope or Sterope (Στερόπη), and she became the mother of Oenomaüs, who became the king of Pisa and the father of Hippodameia. Oenomaüs died in the chariot race against one of his daughter's suitors, Pelops.