Bruh that whole alliance is on a fucking tightrope over some pussy. Euron is wild unstable and was willing to pack his whole fleet up if he ain't get to fuck that night. A fair amount of time passed since the last season. So dude is like "Ma, come on now."

So either she just wanted to fuck, she gave him the pussy to not risk him fucking up her plans, or both.

IMO they both need each other. Cercei ain't moving the needle without that fleet and it's not like Euron got shit going on over in the Iron Islands besides dumb shit.

But only Euron is wild enough to roll out in the middle of a war.