Based on the dragon post. How about something where Tony has a tiny horde of little pet dragons. His friends are used to them. The other avengers are not.
“Honey, no, get out of there…” Tony hefted the little red by her belly, pulling her out of the jam jar and scrambling to get his other hand around her shoulders before she eeled right back in there.
“Steve, get the lid on that, please? I have to go put Jessie in the fire.” He made a kissy face at the dragon, and she craned her head up to lick his face. He stayed just out of reach with an indulgent grin.
“Uh, sure. Sorry for leaving it out, I had no idea,” Steve replied, already putting the lid on his jelly. “I hope it doesn’t make her sick.”
Tony held Jessie away from his body when she wriggled around to start cleaning her jaw against his clothes. “No, no, she’ll be fine. She’ll have more fire than is good for me for a while, but she’ll have a great time.”
He headed towards the fire pit in the living room, Steve trailing after him with his plate of toast. “J, turn the gas on, please.”
The fire belched to life, flames billowing out from between the ceramic gravel and Jessie peeped and squeaked to be let go. Tony tossed her up in the air and she b-lined for the flames, little wings slicing the air for extra speed. She still found the time for an elaborate loop in the thermal current, then dove ignobly into the burning gravel. The jelly caught fire immediately, and she rubbed the sticky flames off on the pebbles, giving off a thick smell of caramelizing sugar.