Oh damn, Boudica's tits are giving way against Raikou's bosom at a steady pace, she just can't hold back.
I see Boudica flexing and straining hard, sweat pouring down her body, cursing the opposing pair so hungrily consuming her space. There is room for concern, both rivals not even locking their arms and still Boudica's tits are weakening.
Raikou feels excited, confident, proud of her breasts strength, bending and pushing back Boudica. Her tits are enjoying the challenge!
I think the best chance for Boudica would be to interrupt the breast pushing fight and smack her pair against Raikou's, just to see if she would fair better in short clashes, at least to even results compared to this situation.
Raikou should focus on what works for now, it is clear that in a full on sustained push, her breasts are making Boudica's tremble, If she wants to escalate the conflict and intensify the fight, she could hug Boudica tightly, not giving her any room to break away from this position.