Alucard’s coat is a part of him . . . which I don’t think Fundamental realizes. (Integral knows it quite well, and under normal circumstances wouldn’t let it touch her.)
And now you know when they ended up (around 12,090 A.D.), even though they weren’t there for long.
Fundamental: Thanks! This robe is so cool!
Alucard (thinking): Just my luck. The one time she puts on my coat, it’s not worth taking advantage of.
Fundamental: Eep! What’s that?!
Vampire Hunter D: Dad?!