During Zagreus', The Prince of the Underworld, attempts to escape the Underworld, you two met! At first it was strange seeing the prince covered in blood from either enemies or the river Styx but you eventually get used to it, he explained his situation and whenever you could you'd help out in tiny bits and bites but you couldn't help like the gods can by giving him different upgrades sadly.
Over time you and Zagreus started to grow closer, small dates here and there but nothing crazy special, then he started to give you nectar and the dates got more elaborate and eventually one thing led to another then one day, or night? Whatever time it is in the underworld and you found yourself bedding the prince of the Underworld and son of Hades.
You guys started to make it serious after that, he'd give you ambrosia whenever he had it but it was always weird to get it, like you're getting the drink of the gods from a prince who probably stole it from somewhere in his fathers house but you couldn't turn him down, he was so cute whenever he gave it to you!
One day you were hanging out with Hypnos when Zagreus came out of the river Styx after a failed escape attempt, he wiped the blood off his face before giving you a kiss on the forehead and going to check out the contractors like he normally does when he noticed something new.
"A new thing? What's this contractors? "A door for the princes chambers" when did that get there?" Zagreus asks as he reads it off the scroll the contractors use, your face just flushes a little when you realize why that's there and Hades just holds his head in his hands hoping his son would accept it, for once he's hoping Zagreus will use the contractors.