Lupa's pack

Lupa the Roman wolf goddess never had any form of demigod children however instead she raised abandoned demigods or abandoned partners of the gods. Becoming their patron she bestowed upon them gifts, becoming essentially werewolves who need not interact with mortal nor god, far stronger than wolf or demigod alike the Demi-lupin would usually never go to camps Half Blood or Jupiter. However sometimes they would feel the need to venture past the pack and investigate their godly heritage, holding back their abilities during any and all training.

Leo runs away, leaving his pack and mate to delve into his fathers side of the family at Camp Half Blood. Insisting not to train instead enjoying time in the forges and bunker nine Leo misses his pack, his brothers and sisters were like a pack for him but they didn't show the affection his real pack did. It's not like they didn't show affection at all it just wasn't the same type of affection, or the same quantity either; he couldn't rub their legs in his wolf form as he would at home or show the same amount or platonic adoration he could or would with his pack. He missed it.

Never being able to transform, go for a hunt or howl at the moon with his fellow demi-lupin was making Leo depressed but he hid it well until his mate - who he missed the most - came to take him home. With a secret kept from demigods Roman or Greek for so long hanging in the balance and the chance to go back home Leo is just happy to have his mate with him again, forgetting why he ever left her in the first place.