Remind him the competition isn't over

His display had impressed you, but you still knew you could win.

"nope, it's my turn now"

"w-what, puny mortal you could ne- UGH!" his annoying whines stopped as you shoved him onto your cock, the sudden intrusion causing his legs to kick, then flail around. His insides were so goddamn tight.

"PL-UGH- please-OUGH, OOH SEVEN HELLS!" the imp was losing coherency, and also size. Rapidly. His insides began to tighten even further. A wet heat- Wait it wasn't just the demon shrinking. The room around you seemed too close, head too close to the ceiling. You were growing.

And it wasn't just growth. Your previously modest body began to rip with muscle, and your balls swelled to the size of the imp's as they slapped together. You thrusting hips were growing hairrier, as was your legs. Your skin was more pinkish than you were used to, and two growths were coming out your forehead.