The boy seems pleased by his gift, which further appeases the demon's spirit — something that longs to give to others. He's meant to fulfill desires, to make people happy.

His eyes brighten up again, and he gently closes the boy's fingers over the coin before withdrawing his hand and gesturing upwards towards the surface. He'd like to continue swimming and exploring, but he also wants to speak to his new companion, to properly introduce himself.

So he starts swimming back upwards, taking his time. Once he finally breaks the surface, he turns to look back at Luca as he treads water.

"Your treasures are very nice. Very pleasing. Some time, I will show you my treasures too."