“My, you’re getting rather full… with how big you are, your belly might just burst…! Are you sure you want this to keep going?” Undertaker asked the younger Reaper, curiously rubbing his growing, taught, smooth belly. “Yes…! If I can find out the capacity of myself, I might just make a big breakthrough! Now, fill me until the tank runs out…!” Othello exclaimed, clearly desiring more. Undertaker smirked curiously, and turned up the pressure of helium for Othello since this interested him too… just how big can a Reaper get?
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I find it intersecting that every time I draw a character I never had done before, it’s always in a situation like this.

But yeah. Othello, a Forensic scientist, gets a sudden obsession with wanting to know how big his body can get and an unlikely visitor, The Undertaker, decides to help him.