(All) (You read the title)
These two meet up in private after midnight just so that they can exchange love.
They give affection via actions. Since Shockwave doesn't really have a mouth and since Soundwave doesn't normally take his mask off they do little forehead bumps or little nuzzles which is cute.
Shockwave loves holding servos with Soundwave while they worked and sometimes Lazerbeak and Ravage(when he was alive) would get protective.
They don't really interface but normally when things get a bit heated they just leave it like that(refer to their sexualities, especially Shockwave).
Shockwave is the big spoon.
Soundwave is the little spoon.
They communicate in silence.
Signs of love and what they mean to each other:
When A is holding B's servo and sqeezes it: Reassuring
When A is holding B's servo and sqeezes it while B sqeezes back: Both trying to calm each other down.
When A goes behind B and hugs: 'I missed you even tho I just saw you like 5 mins ago.'
The two are holding hands: 'I love you <3' 'I love you too <3'
When A nuzzles or forehead bumps with B: 'I love you very much'
When B replies with returning the forehead bump or nuzzle with another foread bump or nuzzle: 'I love you too'
When A sqeezes B's servo with their'z when B looks like they're about to commit 4th degree mass murder: Babe, please calm down-
When A holds B's waist or thighs: Nice.