I agree that Starscream should have small boobs, and Optimus should kiss and bite them until they're covered in marks and his nipples are sore and swollen. Starscream whines and squeals while Optimus sucks on his pretty little tits, getting his valve dripping wet and dangerously close to coming without even having his array touched. Then Optimus pins Starscream down and crushes his giant heavy honkers against Starscream's chest, rubbing their boobs together while he slowly fucks him.
HELL YEAH, BOOBS AND BODY WORSHIP
optimus really would be the type to worship starscream's tits, wouldn't he? he's a total sweetheart, he's always gonna find ways to make his partner feel adored, especially if it means having them come undone in his arms. it's gonna be hard for starscream to think his chest isn't attractive when optimus is sucking on them like his life depends on it.
and oughhhh optimus with big tits... starscream definitely gets some grabby hands and cops a feel while optimus is railing him. he probably uses them as pillows during post interface cuddles
