You show it all.

“Umm, ok. I am almost out of magic though, so I don't know how much I can show you.”

“No problem, I am sure I have a potion around here I can let you drink, it won't fill you, but it should give you enough to show me what you can do.” She fishes around in a several drawers and boxes before handing you a bottle about 12 or so ounces. Popping off the cork you can smell the salty cum inside. “Bottoms up.” She says with a grin and you greedily suck down every drop, even tonguing the bottle to get the last few specks. “There better, now show me.”

“Ok here goes.” With a furrow in your brow you concentrate and make a little scrap of paper catch fire. Then a moment later you snuff it out. Grinning you look at her for approval, but she simply smiles and motions you to continue. Next you decide to get crafty, you use the spell that makes your finger a pen and draw a bed on a piece of paper with two figures on it. Then using the minor illusion you make it pop up, and have the little tiny people start fucking. Then while that is going on you create a little mug of ale and hand it to her. “Try it.” You say with a grin, she shakes her head and takes a sip.

“Not bad, so is that it? Parlor tricks to entertain or distract?”

“No, I have more.” First you make a strap on the flap of the wagon door come to life lash out and find the clasp to tie it off and have it tie itself closed. Then you look at her and smile, “I hope you don't mind.” And conjuring up the spell in your mind you find it takes only a smile, a wink, and to blow her a kiss while concentrating on the effect. As you do the spell she grips the desk hard and her eyes roll back in her head for a second, and you are sure she is going to fall as her feet slip forward. But she seems to resist most of the effect as she is only distracted by the forced orgasm for a second.

She licks her lips, “Oh my, that was something.” She wipes a bead of sweat off her brow, “So is that it?”

“Well that and I can teleport to wherever I can see, but in here I don't think that will be all that impressive. Plus I have some other tricks, but they don't seem to drain my magic so I don't know how they work.”

“Such as?” You answer by first growing your big fat cock, then turning into a human, and finishing by changing your coloration till you perfectly match what is behind you and seem to disappear.

She watches all of it intently then as you turn back to your normal, well at least the coloration you have decided is normal, you see a glimmer in her eye that fades away as if she was using a spell up to that point. “I see, well I hate to say this, but my friends won't let demon magic get to the prime. If you are to come with us I am going to have to shut you down and see if what powers you is demonic, that will increase that will cause you to crave human souls, or just sex magic. Will you let me examine you further, or would you rather stay here? I have to warn you, if I do this and find you are more than you say, I won't let you live.”