What does it mean when my dad’s friend reacts to my selfies on Instagram stories with fire emoji?

I have always gotten a flirty vibe from my dads friend who is a little bit younger than him. He is 41 and I am 20. One night my family was hosting a party that he attended and we were sitting secluded from everyone else and he started taking selfies of just the two of us and was flirty with me, we ended up swapping social media and 1 hour after he left the party he had reacted to a selfie I posted with a fire emoji.

What does it mean when my dad’s friend reacts to my selfies on Instagram stories with fire emoji?
Post Opinion