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Has Starscream told Skyfire about Megatron to make Starscream forget about it? What is his reaction?
Oh no, Skyfire doesn't know about that. Starscream won't tell him yet since it compromises the whole "wanting to rebuild our family" plan (they already have enough with Starscream being a war criminal and their children being used as lab rats, they don't need to add Skyfire going Berserk and killing Megatron to the formula.) Though when things get clearer, and Star is in a better emotional/mental place, he will probably let it out to one of the bots before eventually going to his husband.
When Starscream was carrying, did he have to go through any of the organic-esque problems? (i.e. cravings, mood-swings, tender spots? If so, he must've worked Skyfire to the wire.)
Plus did he ever feel something equivalent to kicks? (Spark flares for protoforms? idk).
Yeah, you can say that he did have cravings. (Tho most of the time he didn't know what he craved, and before Sky let it drive him insane, he just accepted his new reality.)
As for the "kicks", they were more like shocks of static/electricity, and Star suffered them often. Sky would often talk to them and swore the little shock were them answering to him.
And the kids being mixed did not help either. Starscream felt like he was carrying a sack of canonballs inside his cockpit, so flying only got harder from there. Sky would offer to carry him if Star ever got tired of walking (which was often.)