Responses

No not the ml.. I mean the other Dom
And it's not really about being sexual or not, it's about the instinct of the first Dom. Like with the fated pair in omegaverse, when an alpha instinctively claim his omega something like that. Like you (other Doms) have the right to use command on "my" sub.
But at the same time, it's just an honest mistake on Yuri's side coz he didn't know that Al is that possessive with that sub. he just assumed that Al is really only helping the sub, wherein the sub also thinks the same.
Then later realized that he stuck his nose to others' business
(and he was shocked, it's his fault he (or both of them with the sub) just assumed the situation without asking the Dom's side)
Well we can't help but assume things sometimes