Without many other options left, you and Jess resort to attacking Suzi the only way you can: by running up to her now-giant feet and biting her. You go relatively softly: you want her to think of you as a pain she just wants to stop, not as an enemy she wants to see destroyed. But you're persistent.
"All right, ENOUGH!" shouts Suzi. "Fine. Jesus." She toggles the switch on the gun, and fires it on you and Jess, transforming you back into your human form. She then stomps out of the room, clearly annoyed. It is a relief that she's out of the picture.
You breathe a sigh of relief when Suzi leaves the room. You and Jess look at each other and immediately run out of the building, not even stopping to grab your stuff. You decamp to a bar and get several drinks in before you two can even really process your experience of having turned into mice just a few hours before. You connect in a way that you never have before, and soon enough you're back in Jess's apartment.
It's only when the two of you are half-naked in each other's embrace that it occurs to you that Suzi still has the gun. What has she been doing the past four or five hours? What's she going to do next?