The funny thing about Snag is that, yes, he's jealous of Tir in certain ways, but not really the ways you'd necessarily expect. He's utterly chill with Tir touching and having sex with Juniper. This legitimately does not bother him. But as mentioned, he does resent him a little for being able to do things he can't, like fall asleep with Juniper.
He's not even really threatened by their closeness--it isn't that someone else is important to Juniper, that someone else is receiving her love. He's jealous that Tir knows things he doesn't. That they have an easiness with each other and a mutual understanding that he hasn't had time to develop.
Tir is absolutely jealous.
Not about Juniper. He's totally comfortable in their dynamic. Tir is jealous of Juniper. His heart is irrationally squeezing every time the cute but brusque and wary boy he met a week ago and got off on the wrong foot with is sooooo sweet and nice and confident with her compared to him. 😩 And this started as early as. Probably immediately (post-attack).