Why didn't Nick report Serena?

Why didn't Nick report Serena for suggesting to rape June? Which is clearly outside of the laws of Gilead.

Nick tells June later, after the rape, that he's sorry but that he couldn't tell Serena no. Could he really not tell her no, for fear that she would have turned him in for something? She knew he was an Eye and an Eye is supposed to make sure citizens are abiding by Gilead law. So why didn't Nick think that raping June was bad enough to report Serena for it? Wouldn't Nick's boss believe him over Serena?

Did Nick really think the less cruel option was to rape her to save her from going to the Colonies since "her time was running out" to get pregnant, rather than reporting Serena for subjecting her to unauthorized, unceremonious rape by him?

And again, when Nick said he couldn't tell Serena no, was it because she would have gotten him in trouble for something if he refused, or was it because he, personally, couldn't tell her no, knowing that June could have ended up going to the colonies if he didn't try to help her get pregnant? As in, did Nick agree to do it to save her? If it's the latter, then the good intentions become muddled by the fact that he and her were developing feelings for each other, which makes it seem like he was taking advantage of Serena's offer and taking advantage of June's position of not being able to say no.

I wonder if Nick wondered whether subjecting June to the rape of a second man would have pushed her mental health to the brink. You would think after what happened with the previous handmaid that Nick would have been more contentious of the mental health of future handmaids. But maybe it was a toss up between offering to be the one to impregnate her, or her ending up being sent to the Colonies.

Edit: I saw this comment on another post from 2 years ago about Nick and his power. This went more along with my line of thinking. The commentator says, "Nick is above everyone’s “suspicion” because Nick is an Eye. He gets away with stuff the other Commanders do not get away with because he’s part of the group with the ability to prosecute people & turn them in & torture & kill them. Basically, he’s in charge and to speak against him or do anything to piss him off could be a possible death sentence. Every commander in Boston is involved in sketchy shit and Nick’s Eyes know all of this so we know that if someone like Fred tried to report Nick for sleeping with June, then the Eyes would go and inform the Council of all the shit Fred has been up to (which is a hell of a lot) and Fred & Serena would end up on the wall." So basically I thought Nick had more power than I thought because enough people in the comments are saying that even if Nick did report Serena it would end badly for him no matter what.