The face of your girlfriend's captor happened to be none other Mary's own brother, Gareth (or as he was known colloquially, Gary). At the moment, he was looking down on you, flaunting his wriggling belly in your face. You cowered at his presence, initially anxious at what he could do to you. After staring at his stomach for a moment, though, you suddenly get a shot of confidence, and probably adrenaline.
"G-Gary, what the hell do you think you're doing?!" You raise your voice at the boy, apparently surprising him. He quickly reformed his demeanor, though.
"Saving my sis, that's what!" He retorts, patting his belly and causing it to jostle and shake. "As far as I'm concerned, being in my belly is better than being with a limpdick baby like you! Plus, its been a while since I've ate someone that didn't just turn into a ball in my stomach, feels pretty nice!" He continued to rub and massage his stomach, taunting you with your trapped girlfriend. You could recall what it was like inside, and if Mary was experiencing anything close to that, you needed to do something about it!
"You better let her out, Gary, or else I'll... um, I'll-" You stutter, struggling to think of what to do.
"What, baby? Spit it the hell out, I don't have all day to enjoy having a belly full of sister!" Gary threatened.
You think, and the best you can think of is...