She lifted the commander up... by the collar... RIP commander.
Edit: Nobody seems to have gotten the joke even on Pixiv.
Edit 2: Wait... the one who spoke the last line was the commander herself...? I thought m1919 accidentally suffocated the commander.
Updated
Good morning!There!Ah, good morning, Commander.Oh this? It's pretty heavy.But your arms are so thin, how can you heft it around like that?Well, Commander, how about you turn around and show me your collar?Hm? What are you going to do?Say, isn't your gun a bit heavy to be carrying around all the time?Fufu, since you're skeptical, a live demonstration should prove it to you~Oooh! How powerful! You're actually lifting me up!
I'm honestly not too sure about this punchline