The first time it escalates is in the bathhouse.
Ryouga's soapnapped the water-resistant soap that Ranma needs to keep his boy form. Not changing into a girl every time he's splashed with the tiniest bit of water would be his life's dream come true.
So Ranma is determined to do whatever necessary to get it. Including work with Shampoo. And leaning into his female side again. Whatever it takes.
One fake love letter from Akane and a chaotic bathhouse fight later, Ranma is facing down Ryouga in an aisle of the male half of the bathhouse. Ryouga's got the soap clutched between both hands and Ranma's fully nude in his girl form, both crouched to fight. Which is more important, being nude as a girl in a bath full of guys or the magic soap that'll stop him from turning into a girl in the first place? The soap, obviously.
Ryoga seems to disagree as he averts his eyes, turning away, hands still annoyingly cemented around the soap.
Ranma takes the opportunity to kick up at Ryouga's hand, aiming to slip his grip off the soap. Ranma ignores the leers and wolf-whistles from the other men as he does so. Everyone here had already got a glimpse anyway. The only one Ranma cares about here was Ryouga and ew that came out more sentimental than intended but he really didn't know or care about anyone else in this stupid bathhouse. Just Ryouga and the soap. Mainly the soap. He really wants that soap.
Ryouga turns further, leaving Ranma's kick a miss but now Ranma's close enough to aim directly for the soap in Ryouga's hands.
He catches hold of Ryouga's left arm as it swings wide while he turns and Ryouga's attached hand slips its grasp on the soap bar.
Ranma only has a moment to congratulate himself on the quick progress before Ryouga shoves the bar of soap into his mouth, crossing his arms defiantly.
"Hey." Ranma glares but Ryouga's still not looking at him. Ryouga's facing him but his head is turned a full 90 degrees away, cheeks bulging around where his teeth grit the soap in place. It must taste awful. Not that Ryouga has taste buds since he eats Akane's cooking.
"Hey." Ranma prompts again as he darts closer, trying to get in Ryouga's sight. He'll claw the soap out of Ryouga's mouth if he has to but Ranma woulda rather avoid Ryouga's sharp teeth.
Ryouga turns again to face away from Ranma, yanking his arm out of Ranma's grip. Completely contrasting his sense of direction since he knows exactly where not to look.
"Ryouga," Another dart and turn, "Ryoooouga."
Ryouga dares to let out a grunt, muffled by the soap that Ranma assumes is supposed to be a defiant, "Hmph."
"Ryouga." Another turn, "Look at me."
Ryouga turns again and Ranma's sick of it. Well, he was sick of it however many turns ago but now he's more sick of it and he's going to put a stop to it.
Ranma tackles Ryouga from behind, sending him crashing to the ground. While Ryouga's still reeling from the impact, Ranma flips Ryouga over to face him.
Ranma straddles Ryouga to keep him in place, but Ryouga braces his arms in front of his face. Instead of doing the best thing in a fight and ya know. Actually fighting. Ranma lets out a huff of frustration. Not exertion because this isn't even a fight, it's Ryouga cowering from his tits. Pathetic.
And wow sitting like this is weird. Ranma's butt is half on Ryouga's chest, half on his abs and for a second he can feels a wave of something before he shakes his head sits for a few seconds before crossing his arms. Under his tits because he has nothing to be ashamed of. He has gotten very good at ignoring any complicated thoughts about the tits that are/aren't his. Ranma lets out a dramatic huff, once again trying to get Ryouga to at least answer him, "Ryouga."
Ryouga still doesn't answer him and that is it.
Ranma grabs Ryouga's wrists and shoves his arms above his head, leaning over Ryouga's face to pin them to the ground above.
Ryouga's eyes go wider than Ranma had thought possible for human eyes to go. Which Ranma supposes makes sense considering his tits are barely inches from Ryouga's eyes.
Ryouga's face is bright red, flush spreading all the way across, from his cheeks to his ears. Ranma bets it'd hit his shoulders if he looks down. Which he isn't because that is too close to where he is straddling Ryouga and he is not thinking about that.
"Spit it out." Ranma tries.
Ryouga spits it out with speed that surprises Ranma almost as much as his compliance itself. It hits Ranma's chest, making his tits bounce before sliding down to Ryouga's own, stopped by just how close Ranma is pressed to Ryouga. Some blood drips out of Ryouga's nose and Ranma's eyes are wide too as he feels something seeing Ryouga react like this.
There's another wolf whistle from the crowd that's like a cold slap to the face. Cold because his face is hot like Ryouga's. Ranma can feel his heart thump as he reaches down between them, face still feigning complete fluster while his mind is on his victory as he grabs the soap that had slid a little too close to something on this body that he refuses to acknowledge as slippery.
Ranma lets his grin slide onto his face while he stares at Ryouga's even redder face. He doesn't think Ryouga's breathing at this point. It's a point of pride he will be throwing back in Ryouga's face when the need to tease him arises again.
"I win," Ranma holds up the bar of soap before darting away to go use it.
A glance back leaves Ranma with the impression of shock still too potent for Ryouga to move and pride in his win strong enough to last him Ranma a while.