Pregnancy hasn't completely changed Leo--he's still his ruthless leader self, still packs a hell of a punch, still relatively well muscled thanks to all his new exercises he's upheld religiously. Still ridiculously short, of course, and far too eager about no longer being the smallest turtle in the room. 
But he is softer and places, his bridges folding gently to accommodate his growing stomach. His belly ripples gently around Raph's fingers, a soft green unfurling beneath his hands, fueled by Leo's newfound discovery of an appetite to rival Mikey's. 
And the smell--God. Even their human friends say they can smell a bit of a change by now, but Raph's pretty sure they don't find it nearly as mouthwatering as he does. Their brothers' heads will turn as Leo passes and Raph will have to grit his teeth and fight the urge to drape himself over his mate like a toothy, growling scarf, warning them off. 
The solution to the problem, they've discovered, is sex. Lots of it. Sex in the bed, sex in the shower, sex against the walls, sex dangerously close to getting walked in on, they don't care. Leo's still in the horny stage and he's happy to open his thighs and lift his tail at the slightest provocation. 
Here, too, his brother has changed. His bottom is plusher than it was before, soft and generous, and Raph could play with it for hours if his mate didn't get so impatient. His tail, too, has grown larger and heavier, fluttering so eagerly that sometimes Leo lets it wave where the others can see. 
The scales between Leo's legs were always ridiculously soft, but now they're like velvet, giving gently out under Raph's hands. It drives him crazy, the idea of babies coming out of there--his babies, his young, and maybe it's leftover animal instinct, but it drives him wild. 
"Babies," he'll catch himself whispering as he kneels behind his brother, caught off guard midfuck by the desire to lean over and start rubbing Leo's stomach like a sap. "Our fucking babies, man." 
"I noticed," Leo grunts. Like he'll grunt in a couple months when his legs open up and the eggs come out, little mingled pieces of him and Raph emerging into the world to stand on their own tiny feet. At least two, according to Donnie's calculations, and no more than four, thank fuck, with big bright eyes that will look up and rely on them for everything. 
It's terrifying. It's wonderful. And the knowledge that he's played a role in this creation--two little freaks from the sewers, him and Leo, making something wonderful together, it's a rush like nothing Raph has ever experienced. 
"I love you," he gasps, dragging shaking hands over Leo's sides, over the beautiful, familiar scales flowing into new curves. "I love you all so much." 
"I know," Leo grits out. Raph can't even tease him for the Star Wars line because then his hands are passing over his brother's stomach, soft, warm life opening up around his hand, and Leo's crazy magical heat is clenching around him, and Raph is so happy he really, truly can't think anymore.