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The first time, it was an accident. Dinobot bumped into him in the hall.
"Move your giant undercarriage, thunder lizard-thighs," Rattrap said. "Some of us are walkin' here." They were some thighs though, weren't they? he thought. Some hips too, each one as big as his whole adorably furry self. He'd like to see them swing a little more.
"If my undercarriage frightens you, rodent," said the mouth attached to the thighs, "I suggest you stay out of its way." Dinobot gave his tail a dramatic flounce and stalked off down the hall.
A few days later they did it again, and that time it was on purpose. Dinobot banged his big beast-flesh booty around the hallway like a wrecking ball, and Rattrap didn't bother to dodge. Then again the next week. Then again. After a while, Rattrap started bumping up against Dinobot's thighs on his own.
The next time, he tried grabbing a handful. It was as firm as it looked, plump and smooth in his dexterous rodent hands. Dinobot swung his tail like he was swatting a fly, and it smacked Rattrap and sent him tumbling down.
"Yeah," Rattrap said from where he lay flat on his belly, "that was worth it."
Dinobot climbed on top of him and pinned him. "Lecherous vermin," he growled.
"I been called worse."
Those hall-hogging hips rocked up against his rear, clumsily trying to flip up his tail. He felt Dinobot's carnivore breath on the back of his neck, then his carnivore teeth, biting and scruffing him.
He gave a pleased grunt and let his tail be pushed aside, and Dinobot ground on him like he had something to prove.
It went on for a minute before Rattrap said, "You, uh. You need help finding the hole, big guy?"
Dinobot snarled. "I'm a raptor, you ignoramus. I've located your hole. I don't have a phallus in this form."
"Yeah?" Rattrap said, "Well, I ain't got a cloaca, so use your hands."
Dinobot grumbled. He had to arch his back to get his short dino-arms in a position to handle Rattrap's equipment at the same time he was doing his one-sided cloacal kiss.
"Aw yeah," Rattrap said. "That was definitely worth it!"
The bite that followed was less gentle than the first one. Rattrap didn't mind.