But of course, not all of this knowledge had strict warfare applications, as you were about to find out.
When you try to divert some attention on making a magical contraceptive barrier Fritz feels it, and has her hand keeps aggressively jacking you off you feel a sudden influx of mana through your back as she prods into your font of mana with her own. The sensation is gentle, but right now its enough that even this small amount of outside interference is enough that your first attempt at spell construction collapses within you, the spell formation you had been trying to make tumbling apart and the mana reverting back to its natural flow. The act leaves you sputtering for a moment, but no so distracted that you don't feel Fritz's other hand put the cup on the tip of your cock, before she takes the tub and slides it between your legs, quickly inserting it into soaking wet pussy. "Ah ah~ Can't have it be too easy can we?", Fritz then whispers into your ear, her now free hand wrapping around to clutch at your stomach and hold you tight to her, her forearm pressing against the bottoms of your breasts. She begins to to gyrate her hips then, letting her own hardon rub hard on your slit and backdoor, it's girth grinding alone your sides.
At this point it seems like your incredibly naughty aide's plan is revealed, and even as you resist it's clear you'd be cumming soon. Question was, would you manage to form your contraceptive spell before it was too late?