Ok so we know that Tim keeps photographs of his brothers & he masturbates to them. Now I HC that Damian create drawings of his big brothers fully naked in sexual positions. And he too, masturbates to them. So some of those drawings have cum stains on them. So are some of Tim's photographs.
One day, either Damian finds out about Tim's photographs or Tim finds out about Damian's drawings.
Either way, they propose a trade: 1 photograph of Dick (for Damian) = 1 drawing of Jason (for Tim). And in the midst of this, they reached a mutual understanding & eventually a permanent truce - think of WFA season 2 episodes 64-65.
Dick is happy & Jason is glad that Tim & Damian are finally on speaking terms, but they do find it suspicious that they're way too buddy-buddy with each other.
That’s like their saturday’s nights and everyone is just happy for them getting along until every saturday their room is too quiet. No scream or fights, suddenly Tim and Damian are even defending each others?
I bet someone check at some point (probably Dick.) and he sees the pics and drawing and he wish he didn’t.
To make it funnier Jason and Dick are dating. So Dick goes to tell Jason their litlle brothers are thirsting over them. Now Jason wanna be petty so they have a plan to catch them in the mid of exchanging those pictures.
Short story they all fuck that night and Bruce is now the one worried his sons are all hanging out together so much.