
I’m sorry, but if you think that wasn’t rape, you’re ignorant and need to google more about rape. He did NOT give consent to having sex with the alpha (apologies for not knowing their names). He repeated numerous times “no” and that he didn’t want it. It doesn’t matter how turned on he is, or that he’s married/bonded to the man. It’s still rape until he gives proper consent, which he has not. Period. (Sorry if this sends twice)

Just because he called someone's name, while attempting to masturbate and exploring his body to feel sexual pleasure, does not mean he wanted that person to physically be there and violate him.
This was Hyesung experimenting and having an intimate moment with himself and his body. He was trying to discover his likes, dislikes, what works and what doesn't.
But most importantly and bottomline is that Hyesung said NO.
Multiple times he shouted it out loud.
"NO! STOP!"
End of.
Consent was not given. Neither beforehand nor during. And it cannot be given after because that's not how it works. (Maybe there are exceptions but this case is definitely not one of them.)
This was rape.
And considering that the two involved are married, it falls under /marital/ rape.

You say Hyesung 'could have kicked him [Dojin] out of the bed', but did you not see how surprised he was?
How he was in a vulnerable state, not to mention the position he was in?
How much physically bigger and stronger Dojin is to Hyesung?
Sure, it's not an impossibility, but Hyesung's ability and chances of preventing what happened in ch.70 were slim. Especailly when taken into account previous times that this same or similar situations happened where Dojin does not respect Hyesung's refusal or unwillingness to have sex, to being touched, and continues on doing whatever Dojin wants despite how Hyesung feels or reacts or when he says 'No'.
I know there's a lot of miscommunication, misunderstandings, and plenty of times where Hyesung said 'No' but didn't really mean it. And that's a really big problem in every kind of media out there, highly prevalent in yaoi, but when someone says 'No', you do NOT keep going.
You STOP.
As I said before, there may be exceptions such as prearranged roleplay, and in those situations there should be a safeword or phrase to make clear that you/the person is no longer playing and they want to stop.
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This is fiction, but we all need to be aware of what's ok and what's not and to stop making jokes or taking rape lightly.

Is the ex a woman? I’ve been assuming they were a man, but with all the more feminine pronouns(?) (Like saying madam) and the beautiful appearance, I’m having a hard time telling

Nope its a man... its a weird thing about omegaverses depending on the author. A lot of authors tend to call them men too, but fargo (this author) uses female pronouns for omegas. So idk if you've noticed, but Byul calls Hyesung Mama not papa. They are seen as pretty and lady like so therefore they are treated as women
Whyyyyy can’t I stop rereading this? This manga has been in the first page of my favorites since I first joined Mangago a few years ago and I still can’t stop rereading it