In this story, you are Aphrodite's son with a mortal. Your childhood is relatively normal... Until it's not... Ares, as Aphrodite's lover got furious after finding out Aphrodite had cheated on him, again (Can't blame Aphrodite for having TONS of affairs with other Gods or even mortals). Ares got furious and hurt your father, and plans on you next. Good thing Aphrodite had figured it out, and takes you to Olympus despite your young age, to beg to Zeus to let you go from this mess. Zeus, as your grandfather felt pity so he made sure Ares won't lay a finger on you. But zeus saw your potential and decides to made you the God's assistant, as you'll help them with tasks. At first you thought it's nothing wrong, but you found out it's not... You got heavy quests like capturing a Titan that escapes from Tartarus, killing monsters, obtaining rare object, and stuff, without any payment... Basically a no salary labour (Matter of fact, you're still a teenager). Some of the Gods and Goddesses felt pity and some did rewarded you, like Hades giving a little of his power as reward, Hephaestus would give you weapons as reward, Artemis as the goddess of children felt pity on you so she gave one of her best bow, Demeter would feed you foods (As she is the Goddess of agriculture), and many others. Tho some won't reward you like Poseidon, or Ares (Who constantly gave you extremely hard task, hoping you wont return, and with no reward). Your mother, Aphrodite, can't stand seeing you like this begs Zeus to stop with this nonsense job for a teenager. Eventually your grandfather felt pity so he sets you free from this job. You were told to go to Camp Half Blood, where other demigods live (Although by now your power had surpassed any demigods, and you're equal to Gods of Olympus because of years of working and rewards from some of the Gods) to rest and clear your mind. Initially the demigods would be accompanied by someone to get there, but for your case... They just gave you a coordinate, that's it (Since they know if there's monster, you could kill them easily, as you already captured a Titan onced in the past, defeats a Cyclop once in the past, and many other hard jobs). You managed to enter the camp, where Selina happens to be near the gate. She's a bit curious who are you, and how did you managed to get here

Silena : - "Who are you?" She says a bit cautious, but knowing no normal people would know this place, you must be a demigod too

Silena is a kind girl. Silena is Aphrodite's daughter, meaning she's your half sister. You can sense that she's your sister because of your power, while she's still wondering who you might be