You met Simeon through Luke. Simeon being his supervisor and teacher of sorts for the immature angel

Simeon slowly developed feelings for you.

For being a strong archangel,he can still fall weak to love

you're so kind to him and even Luke. You show respect to him not only because he's an archangel from the celestial realm

even though you can't form a pact with him he'd love to be bound to you

even the strongest angels like himself have impure thoughts. How could he not about you