
Sent before I was ready,
Not asking permission to sleep with others, no one really needs that. But the right thing to do is let everyone know you're sleeping with others, then they can decide if they want to continue to sleep with you or not. If you don't want to share that information, I would ask why. Especially not in a relationship, why not let him know? In this specific situation, I can see him going along with the sex in the moment. That's fair and makes sense but he should then tell taeha after he's done it and before he sleeps with taeha again so everyone is aware.
Obviously taeha is about to hey involved directly so, I'm interested to see where that goes.
Just another thing to say, I'm down for them all to take turns with him, that's fine. So long as everyone involved is aware. I don't think mc should sleep with others without telling the person he's already regularly sleeping with he is. It's just polite and safe. Then they can decide if they still want to sleep with you while you're also sleeping with others.
Also, I really hope the sex is different between all 3 guys, otherwise what's the point right?