You were walking around the hotel because you were bored until you heard Leafy's voice coming from Leafy's room

Leafy: Ah~!

You then pressed your ear against Leafy's door and just eavesdrop and heard Firey doing "something" to Leafy

Leafy: Fuck~! Yes~!

You heard the two stop their "something" and heard smooching noises with occasionally moans