I wouldn't kiss anyone after drinking that unless I'm ready for them to retaliate unfavorably.

[Tohsaka pouts a bit at his reaction. Not because she doesn't like it. No, it's that he has such a reasonable reaction that she frowns. Of all times for him to question her! She hates that she's a little charmed by this unusual level-headedness.]

Magical energy as I know it is produced by the inner self, your life force - or "Od". It can also be absorbed by the ambient energies in your environment called "mana". The magical energy is absorbed by the body like osmosis and settled in the body fluids of a person. Saliva and blood are options, but are relatively low in concentration when considering other avenues.