Due to her status as a monster, Rider gains more mana from drinking the blood of magus then most other transfer means, aside from sez.
That status also includes being a bitch?
AaaaaahrumbleThanks for the meal,
ShirouI, I really have no idea what you're talking about! Well!? Rider!?What's all this then!? What's this about the night!?S-she didn't say anything about night...There's something on your nape......
Ah... That's from Yesterday'sPut down the senbei