And...go!

You stare at her, one eyebrow raised and list off some items that (while could have been beneficial to humanity) where not taken out of the testing phase because of her "tests". "There's the Teleporter, which only teleported us and not our clothes, theres the prosthetic arm that stripped us, theres the Pocket Dimension Storage vial which only grabbed inorganic material, i.e. our clothes, theres the De-Ageing gun which not only did the opposite of what it was supposed to, but turned our clothes and itself to dust. Have I forgotten anything?"

Ming stares at you in both light surprise and looking lightly ticked off. You admit she looks cute like that, but that look also means two things. A. She's pissed. B. She's gonna make you do the experiment anyway.

"Well, you can think that all you want but this serum needs testing. Either you can use it or I can, while you record what happens and we'll see if it ends up like the last couple of times."

Tough choice. On one hand, possibility of this serum not working at all or worse killing you, on the other hand could kill your crush and make you feel guilty about not taking the risk.