Actually, it makes sense from a certain perspective, but a lot of people went on the opposite direction, it would make perfect sense if instead went the way of having something with the team, though Zorlun may "kill" that to save time.the three of them, or it will eventually expand. Something to discover in the future, I suppose, but personally.. I think it wouldn't make sense if it got expanded to say, Marc's basketball mates.. I believe it could be a bit more interesting if it's something between the three of them.
You have a "dom" perspective, but in the "sub", there is more than one way in which Myriam can end up doing it, without need for Marc to go "Anthony" level (e.g. she knows how important is basket for Marc, and wants to guarantee him a place, or they get a good victory and she helps having a celebration for the team at the old home with the pool before selling it, even if not doing staff in the pool to avoid "external witnesses", and things get out of control).
In reality, at least some that suggested going that way, were also with a "Myriam dom" perspective like you.
They were the one suggesting Myriam to be, if you allow the expression, "bitchingly blue balling netoraring" Marc, i.e. as in, Marc cannot touch her, while she has him see how she "does" the entire team - somebody even indicating explicitly that would be a kind of transversal vengeance towards Anthony (Anthony being Marc's father, both in the incest and no incest version).
Personally, I think that would be going too far for Myriam, in the sense that I would not even see it as "dom", but rather as a form of sadism by Myriam.
Instead a discriminating between whether something can (not guaranteed even there) happen with the team or not, could be exactly whether Myriam keep the control acting "dom" and thus refusing, or let herself being pushed by the boys ("sub") and let the stuff happening, knowing that in that case, it could even happen at school (extra risk, extra kinky), and if it happens once, could happen more times ;-), or that could happen at home, and then the boys at school propose it again in the shower.