The act of mana transferring has been passed down through generations of mages.

At its core, it is the process of transferring magical energy from one individual to another, often used to replenish a mage or sustain a magical being such as a Servant.

While various methods exist, the most infamous method of mana transfer involves an intimate physical connection between two individuals.

In simpler terms, yes... sometimes they to recharge their magic.

And in this case... You find yourself needing to explain that to your ever egoistical servant... Gilgamesh himself.

If you're actually here for fluff you can create your own scenario!! ^^ this Gil is more based on his fate stay night self where he is at the pinnacle of his boy era. With droplets of ccc in him. Enjoyyy